spa.c revision 290757
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2013 by Delphix. All rights reserved. 25 * Copyright (c) 2015, Nexenta Systems, Inc. All rights reserved. 26 * Copyright (c) 2013 Martin Matuska <mm@FreeBSD.org>. All rights reserved. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright 2013 Saso Kiselkov. All rights reserved. 29 */ 30 31/* 32 * SPA: Storage Pool Allocator 33 * 34 * This file contains all the routines used when modifying on-disk SPA state. 35 * This includes opening, importing, destroying, exporting a pool, and syncing a 36 * pool. 37 */ 38 39#include <sys/zfs_context.h> 40#include <sys/fm/fs/zfs.h> 41#include <sys/spa_impl.h> 42#include <sys/zio.h> 43#include <sys/zio_checksum.h> 44#include <sys/dmu.h> 45#include <sys/dmu_tx.h> 46#include <sys/zap.h> 47#include <sys/zil.h> 48#include <sys/ddt.h> 49#include <sys/vdev_impl.h> 50#include <sys/metaslab.h> 51#include <sys/metaslab_impl.h> 52#include <sys/uberblock_impl.h> 53#include <sys/txg.h> 54#include <sys/avl.h> 55#include <sys/dmu_traverse.h> 56#include <sys/dmu_objset.h> 57#include <sys/unique.h> 58#include <sys/dsl_pool.h> 59#include <sys/dsl_dataset.h> 60#include <sys/dsl_dir.h> 61#include <sys/dsl_prop.h> 62#include <sys/dsl_synctask.h> 63#include <sys/fs/zfs.h> 64#include <sys/arc.h> 65#include <sys/callb.h> 66#include <sys/spa_boot.h> 67#include <sys/zfs_ioctl.h> 68#include <sys/dsl_scan.h> 69#include <sys/dmu_send.h> 70#include <sys/dsl_destroy.h> 71#include <sys/dsl_userhold.h> 72#include <sys/zfeature.h> 73#include <sys/zvol.h> 74#include <sys/trim_map.h> 75 76#ifdef _KERNEL 77#include <sys/callb.h> 78#include <sys/cpupart.h> 79#include <sys/zone.h> 80#endif /* _KERNEL */ 81 82#include "zfs_prop.h" 83#include "zfs_comutil.h" 84 85/* Check hostid on import? */ 86static int check_hostid = 1; 87 88SYSCTL_DECL(_vfs_zfs); 89TUNABLE_INT("vfs.zfs.check_hostid", &check_hostid); 90SYSCTL_INT(_vfs_zfs, OID_AUTO, check_hostid, CTLFLAG_RW, &check_hostid, 0, 91 "Check hostid on import?"); 92 93/* 94 * The interval, in seconds, at which failed configuration cache file writes 95 * should be retried. 96 */ 97static int zfs_ccw_retry_interval = 300; 98 99typedef enum zti_modes { 100 ZTI_MODE_FIXED, /* value is # of threads (min 1) */ 101 ZTI_MODE_BATCH, /* cpu-intensive; value is ignored */ 102 ZTI_MODE_NULL, /* don't create a taskq */ 103 ZTI_NMODES 104} zti_modes_t; 105 106#define ZTI_P(n, q) { ZTI_MODE_FIXED, (n), (q) } 107#define ZTI_BATCH { ZTI_MODE_BATCH, 0, 1 } 108#define ZTI_NULL { ZTI_MODE_NULL, 0, 0 } 109 110#define ZTI_N(n) ZTI_P(n, 1) 111#define ZTI_ONE ZTI_N(1) 112 113typedef struct zio_taskq_info { 114 zti_modes_t zti_mode; 115 uint_t zti_value; 116 uint_t zti_count; 117} zio_taskq_info_t; 118 119static const char *const zio_taskq_types[ZIO_TASKQ_TYPES] = { 120 "issue", "issue_high", "intr", "intr_high" 121}; 122 123/* 124 * This table defines the taskq settings for each ZFS I/O type. When 125 * initializing a pool, we use this table to create an appropriately sized 126 * taskq. Some operations are low volume and therefore have a small, static 127 * number of threads assigned to their taskqs using the ZTI_N(#) or ZTI_ONE 128 * macros. Other operations process a large amount of data; the ZTI_BATCH 129 * macro causes us to create a taskq oriented for throughput. Some operations 130 * are so high frequency and short-lived that the taskq itself can become a a 131 * point of lock contention. The ZTI_P(#, #) macro indicates that we need an 132 * additional degree of parallelism specified by the number of threads per- 133 * taskq and the number of taskqs; when dispatching an event in this case, the 134 * particular taskq is chosen at random. 135 * 136 * The different taskq priorities are to handle the different contexts (issue 137 * and interrupt) and then to reserve threads for ZIO_PRIORITY_NOW I/Os that 138 * need to be handled with minimum delay. 139 */ 140const zio_taskq_info_t zio_taskqs[ZIO_TYPES][ZIO_TASKQ_TYPES] = { 141 /* ISSUE ISSUE_HIGH INTR INTR_HIGH */ 142 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* NULL */ 143 { ZTI_N(8), ZTI_NULL, ZTI_BATCH, ZTI_NULL }, /* READ */ 144 { ZTI_BATCH, ZTI_N(5), ZTI_N(8), ZTI_N(5) }, /* WRITE */ 145 { ZTI_P(12, 8), ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* FREE */ 146 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* CLAIM */ 147 { ZTI_ONE, ZTI_NULL, ZTI_ONE, ZTI_NULL }, /* IOCTL */ 148}; 149 150static void spa_sync_version(void *arg, dmu_tx_t *tx); 151static void spa_sync_props(void *arg, dmu_tx_t *tx); 152static boolean_t spa_has_active_shared_spare(spa_t *spa); 153static int spa_load_impl(spa_t *spa, uint64_t, nvlist_t *config, 154 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 155 char **ereport); 156static void spa_vdev_resilver_done(spa_t *spa); 157 158uint_t zio_taskq_batch_pct = 75; /* 1 thread per cpu in pset */ 159#ifdef PSRSET_BIND 160id_t zio_taskq_psrset_bind = PS_NONE; 161#endif 162#ifdef SYSDC 163boolean_t zio_taskq_sysdc = B_TRUE; /* use SDC scheduling class */ 164#endif 165uint_t zio_taskq_basedc = 80; /* base duty cycle */ 166 167boolean_t spa_create_process = B_TRUE; /* no process ==> no sysdc */ 168extern int zfs_sync_pass_deferred_free; 169 170#ifndef illumos 171extern void spa_deadman(void *arg); 172#endif 173 174/* 175 * This (illegal) pool name is used when temporarily importing a spa_t in order 176 * to get the vdev stats associated with the imported devices. 177 */ 178#define TRYIMPORT_NAME "$import" 179 180/* 181 * ========================================================================== 182 * SPA properties routines 183 * ========================================================================== 184 */ 185 186/* 187 * Add a (source=src, propname=propval) list to an nvlist. 188 */ 189static void 190spa_prop_add_list(nvlist_t *nvl, zpool_prop_t prop, char *strval, 191 uint64_t intval, zprop_source_t src) 192{ 193 const char *propname = zpool_prop_to_name(prop); 194 nvlist_t *propval; 195 196 VERIFY(nvlist_alloc(&propval, NV_UNIQUE_NAME, KM_SLEEP) == 0); 197 VERIFY(nvlist_add_uint64(propval, ZPROP_SOURCE, src) == 0); 198 199 if (strval != NULL) 200 VERIFY(nvlist_add_string(propval, ZPROP_VALUE, strval) == 0); 201 else 202 VERIFY(nvlist_add_uint64(propval, ZPROP_VALUE, intval) == 0); 203 204 VERIFY(nvlist_add_nvlist(nvl, propname, propval) == 0); 205 nvlist_free(propval); 206} 207 208/* 209 * Get property values from the spa configuration. 210 */ 211static void 212spa_prop_get_config(spa_t *spa, nvlist_t **nvp) 213{ 214 vdev_t *rvd = spa->spa_root_vdev; 215 dsl_pool_t *pool = spa->spa_dsl_pool; 216 uint64_t size, alloc, cap, version; 217 zprop_source_t src = ZPROP_SRC_NONE; 218 spa_config_dirent_t *dp; 219 metaslab_class_t *mc = spa_normal_class(spa); 220 221 ASSERT(MUTEX_HELD(&spa->spa_props_lock)); 222 223 if (rvd != NULL) { 224 alloc = metaslab_class_get_alloc(spa_normal_class(spa)); 225 size = metaslab_class_get_space(spa_normal_class(spa)); 226 spa_prop_add_list(*nvp, ZPOOL_PROP_NAME, spa_name(spa), 0, src); 227 spa_prop_add_list(*nvp, ZPOOL_PROP_SIZE, NULL, size, src); 228 spa_prop_add_list(*nvp, ZPOOL_PROP_ALLOCATED, NULL, alloc, src); 229 spa_prop_add_list(*nvp, ZPOOL_PROP_FREE, NULL, 230 size - alloc, src); 231 232 spa_prop_add_list(*nvp, ZPOOL_PROP_FRAGMENTATION, NULL, 233 metaslab_class_fragmentation(mc), src); 234 spa_prop_add_list(*nvp, ZPOOL_PROP_EXPANDSZ, NULL, 235 metaslab_class_expandable_space(mc), src); 236 spa_prop_add_list(*nvp, ZPOOL_PROP_READONLY, NULL, 237 (spa_mode(spa) == FREAD), src); 238 239 cap = (size == 0) ? 0 : (alloc * 100 / size); 240 spa_prop_add_list(*nvp, ZPOOL_PROP_CAPACITY, NULL, cap, src); 241 242 spa_prop_add_list(*nvp, ZPOOL_PROP_DEDUPRATIO, NULL, 243 ddt_get_pool_dedup_ratio(spa), src); 244 245 spa_prop_add_list(*nvp, ZPOOL_PROP_HEALTH, NULL, 246 rvd->vdev_state, src); 247 248 version = spa_version(spa); 249 if (version == zpool_prop_default_numeric(ZPOOL_PROP_VERSION)) 250 src = ZPROP_SRC_DEFAULT; 251 else 252 src = ZPROP_SRC_LOCAL; 253 spa_prop_add_list(*nvp, ZPOOL_PROP_VERSION, NULL, version, src); 254 } 255 256 if (pool != NULL) { 257 /* 258 * The $FREE directory was introduced in SPA_VERSION_DEADLISTS, 259 * when opening pools before this version freedir will be NULL. 260 */ 261 if (pool->dp_free_dir != NULL) { 262 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, NULL, 263 dsl_dir_phys(pool->dp_free_dir)->dd_used_bytes, 264 src); 265 } else { 266 spa_prop_add_list(*nvp, ZPOOL_PROP_FREEING, 267 NULL, 0, src); 268 } 269 270 if (pool->dp_leak_dir != NULL) { 271 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, NULL, 272 dsl_dir_phys(pool->dp_leak_dir)->dd_used_bytes, 273 src); 274 } else { 275 spa_prop_add_list(*nvp, ZPOOL_PROP_LEAKED, 276 NULL, 0, src); 277 } 278 } 279 280 spa_prop_add_list(*nvp, ZPOOL_PROP_GUID, NULL, spa_guid(spa), src); 281 282 if (spa->spa_comment != NULL) { 283 spa_prop_add_list(*nvp, ZPOOL_PROP_COMMENT, spa->spa_comment, 284 0, ZPROP_SRC_LOCAL); 285 } 286 287 if (spa->spa_root != NULL) 288 spa_prop_add_list(*nvp, ZPOOL_PROP_ALTROOT, spa->spa_root, 289 0, ZPROP_SRC_LOCAL); 290 291 if (spa_feature_is_enabled(spa, SPA_FEATURE_LARGE_BLOCKS)) { 292 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 293 MIN(zfs_max_recordsize, SPA_MAXBLOCKSIZE), ZPROP_SRC_NONE); 294 } else { 295 spa_prop_add_list(*nvp, ZPOOL_PROP_MAXBLOCKSIZE, NULL, 296 SPA_OLD_MAXBLOCKSIZE, ZPROP_SRC_NONE); 297 } 298 299 if ((dp = list_head(&spa->spa_config_list)) != NULL) { 300 if (dp->scd_path == NULL) { 301 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 302 "none", 0, ZPROP_SRC_LOCAL); 303 } else if (strcmp(dp->scd_path, spa_config_path) != 0) { 304 spa_prop_add_list(*nvp, ZPOOL_PROP_CACHEFILE, 305 dp->scd_path, 0, ZPROP_SRC_LOCAL); 306 } 307 } 308} 309 310/* 311 * Get zpool property values. 312 */ 313int 314spa_prop_get(spa_t *spa, nvlist_t **nvp) 315{ 316 objset_t *mos = spa->spa_meta_objset; 317 zap_cursor_t zc; 318 zap_attribute_t za; 319 int err; 320 321 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0); 322 323 mutex_enter(&spa->spa_props_lock); 324 325 /* 326 * Get properties from the spa config. 327 */ 328 spa_prop_get_config(spa, nvp); 329 330 /* If no pool property object, no more prop to get. */ 331 if (mos == NULL || spa->spa_pool_props_object == 0) { 332 mutex_exit(&spa->spa_props_lock); 333 return (0); 334 } 335 336 /* 337 * Get properties from the MOS pool property object. 338 */ 339 for (zap_cursor_init(&zc, mos, spa->spa_pool_props_object); 340 (err = zap_cursor_retrieve(&zc, &za)) == 0; 341 zap_cursor_advance(&zc)) { 342 uint64_t intval = 0; 343 char *strval = NULL; 344 zprop_source_t src = ZPROP_SRC_DEFAULT; 345 zpool_prop_t prop; 346 347 if ((prop = zpool_name_to_prop(za.za_name)) == ZPROP_INVAL) 348 continue; 349 350 switch (za.za_integer_length) { 351 case 8: 352 /* integer property */ 353 if (za.za_first_integer != 354 zpool_prop_default_numeric(prop)) 355 src = ZPROP_SRC_LOCAL; 356 357 if (prop == ZPOOL_PROP_BOOTFS) { 358 dsl_pool_t *dp; 359 dsl_dataset_t *ds = NULL; 360 361 dp = spa_get_dsl(spa); 362 dsl_pool_config_enter(dp, FTAG); 363 if (err = dsl_dataset_hold_obj(dp, 364 za.za_first_integer, FTAG, &ds)) { 365 dsl_pool_config_exit(dp, FTAG); 366 break; 367 } 368 369 strval = kmem_alloc( 370 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, 371 KM_SLEEP); 372 dsl_dataset_name(ds, strval); 373 dsl_dataset_rele(ds, FTAG); 374 dsl_pool_config_exit(dp, FTAG); 375 } else { 376 strval = NULL; 377 intval = za.za_first_integer; 378 } 379 380 spa_prop_add_list(*nvp, prop, strval, intval, src); 381 382 if (strval != NULL) 383 kmem_free(strval, 384 MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); 385 386 break; 387 388 case 1: 389 /* string property */ 390 strval = kmem_alloc(za.za_num_integers, KM_SLEEP); 391 err = zap_lookup(mos, spa->spa_pool_props_object, 392 za.za_name, 1, za.za_num_integers, strval); 393 if (err) { 394 kmem_free(strval, za.za_num_integers); 395 break; 396 } 397 spa_prop_add_list(*nvp, prop, strval, 0, src); 398 kmem_free(strval, za.za_num_integers); 399 break; 400 401 default: 402 break; 403 } 404 } 405 zap_cursor_fini(&zc); 406 mutex_exit(&spa->spa_props_lock); 407out: 408 if (err && err != ENOENT) { 409 nvlist_free(*nvp); 410 *nvp = NULL; 411 return (err); 412 } 413 414 return (0); 415} 416 417/* 418 * Validate the given pool properties nvlist and modify the list 419 * for the property values to be set. 420 */ 421static int 422spa_prop_validate(spa_t *spa, nvlist_t *props) 423{ 424 nvpair_t *elem; 425 int error = 0, reset_bootfs = 0; 426 uint64_t objnum = 0; 427 boolean_t has_feature = B_FALSE; 428 429 elem = NULL; 430 while ((elem = nvlist_next_nvpair(props, elem)) != NULL) { 431 uint64_t intval; 432 char *strval, *slash, *check, *fname; 433 const char *propname = nvpair_name(elem); 434 zpool_prop_t prop = zpool_name_to_prop(propname); 435 436 switch (prop) { 437 case ZPROP_INVAL: 438 if (!zpool_prop_feature(propname)) { 439 error = SET_ERROR(EINVAL); 440 break; 441 } 442 443 /* 444 * Sanitize the input. 445 */ 446 if (nvpair_type(elem) != DATA_TYPE_UINT64) { 447 error = SET_ERROR(EINVAL); 448 break; 449 } 450 451 if (nvpair_value_uint64(elem, &intval) != 0) { 452 error = SET_ERROR(EINVAL); 453 break; 454 } 455 456 if (intval != 0) { 457 error = SET_ERROR(EINVAL); 458 break; 459 } 460 461 fname = strchr(propname, '@') + 1; 462 if (zfeature_lookup_name(fname, NULL) != 0) { 463 error = SET_ERROR(EINVAL); 464 break; 465 } 466 467 has_feature = B_TRUE; 468 break; 469 470 case ZPOOL_PROP_VERSION: 471 error = nvpair_value_uint64(elem, &intval); 472 if (!error && 473 (intval < spa_version(spa) || 474 intval > SPA_VERSION_BEFORE_FEATURES || 475 has_feature)) 476 error = SET_ERROR(EINVAL); 477 break; 478 479 case ZPOOL_PROP_DELEGATION: 480 case ZPOOL_PROP_AUTOREPLACE: 481 case ZPOOL_PROP_LISTSNAPS: 482 case ZPOOL_PROP_AUTOEXPAND: 483 error = nvpair_value_uint64(elem, &intval); 484 if (!error && intval > 1) 485 error = SET_ERROR(EINVAL); 486 break; 487 488 case ZPOOL_PROP_BOOTFS: 489 /* 490 * If the pool version is less than SPA_VERSION_BOOTFS, 491 * or the pool is still being created (version == 0), 492 * the bootfs property cannot be set. 493 */ 494 if (spa_version(spa) < SPA_VERSION_BOOTFS) { 495 error = SET_ERROR(ENOTSUP); 496 break; 497 } 498 499 /* 500 * Make sure the vdev config is bootable 501 */ 502 if (!vdev_is_bootable(spa->spa_root_vdev)) { 503 error = SET_ERROR(ENOTSUP); 504 break; 505 } 506 507 reset_bootfs = 1; 508 509 error = nvpair_value_string(elem, &strval); 510 511 if (!error) { 512 objset_t *os; 513 uint64_t propval; 514 515 if (strval == NULL || strval[0] == '\0') { 516 objnum = zpool_prop_default_numeric( 517 ZPOOL_PROP_BOOTFS); 518 break; 519 } 520 521 if (error = dmu_objset_hold(strval, FTAG, &os)) 522 break; 523 524 /* 525 * Must be ZPL, and its property settings 526 * must be supported by GRUB (compression 527 * is not gzip, and large blocks are not used). 528 */ 529 530 if (dmu_objset_type(os) != DMU_OST_ZFS) { 531 error = SET_ERROR(ENOTSUP); 532 } else if ((error = 533 dsl_prop_get_int_ds(dmu_objset_ds(os), 534 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 535 &propval)) == 0 && 536 !BOOTFS_COMPRESS_VALID(propval)) { 537 error = SET_ERROR(ENOTSUP); 538 } else if ((error = 539 dsl_prop_get_int_ds(dmu_objset_ds(os), 540 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 541 &propval)) == 0 && 542 propval > SPA_OLD_MAXBLOCKSIZE) { 543 error = SET_ERROR(ENOTSUP); 544 } else { 545 objnum = dmu_objset_id(os); 546 } 547 dmu_objset_rele(os, FTAG); 548 } 549 break; 550 551 case ZPOOL_PROP_FAILUREMODE: 552 error = nvpair_value_uint64(elem, &intval); 553 if (!error && (intval < ZIO_FAILURE_MODE_WAIT || 554 intval > ZIO_FAILURE_MODE_PANIC)) 555 error = SET_ERROR(EINVAL); 556 557 /* 558 * This is a special case which only occurs when 559 * the pool has completely failed. This allows 560 * the user to change the in-core failmode property 561 * without syncing it out to disk (I/Os might 562 * currently be blocked). We do this by returning 563 * EIO to the caller (spa_prop_set) to trick it 564 * into thinking we encountered a property validation 565 * error. 566 */ 567 if (!error && spa_suspended(spa)) { 568 spa->spa_failmode = intval; 569 error = SET_ERROR(EIO); 570 } 571 break; 572 573 case ZPOOL_PROP_CACHEFILE: 574 if ((error = nvpair_value_string(elem, &strval)) != 0) 575 break; 576 577 if (strval[0] == '\0') 578 break; 579 580 if (strcmp(strval, "none") == 0) 581 break; 582 583 if (strval[0] != '/') { 584 error = SET_ERROR(EINVAL); 585 break; 586 } 587 588 slash = strrchr(strval, '/'); 589 ASSERT(slash != NULL); 590 591 if (slash[1] == '\0' || strcmp(slash, "/.") == 0 || 592 strcmp(slash, "/..") == 0) 593 error = SET_ERROR(EINVAL); 594 break; 595 596 case ZPOOL_PROP_COMMENT: 597 if ((error = nvpair_value_string(elem, &strval)) != 0) 598 break; 599 for (check = strval; *check != '\0'; check++) { 600 /* 601 * The kernel doesn't have an easy isprint() 602 * check. For this kernel check, we merely 603 * check ASCII apart from DEL. Fix this if 604 * there is an easy-to-use kernel isprint(). 605 */ 606 if (*check >= 0x7f) { 607 error = SET_ERROR(EINVAL); 608 break; 609 } 610 check++; 611 } 612 if (strlen(strval) > ZPROP_MAX_COMMENT) 613 error = E2BIG; 614 break; 615 616 case ZPOOL_PROP_DEDUPDITTO: 617 if (spa_version(spa) < SPA_VERSION_DEDUP) 618 error = SET_ERROR(ENOTSUP); 619 else 620 error = nvpair_value_uint64(elem, &intval); 621 if (error == 0 && 622 intval != 0 && intval < ZIO_DEDUPDITTO_MIN) 623 error = SET_ERROR(EINVAL); 624 break; 625 } 626 627 if (error) 628 break; 629 } 630 631 if (!error && reset_bootfs) { 632 error = nvlist_remove(props, 633 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), DATA_TYPE_STRING); 634 635 if (!error) { 636 error = nvlist_add_uint64(props, 637 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), objnum); 638 } 639 } 640 641 return (error); 642} 643 644void 645spa_configfile_set(spa_t *spa, nvlist_t *nvp, boolean_t need_sync) 646{ 647 char *cachefile; 648 spa_config_dirent_t *dp; 649 650 if (nvlist_lookup_string(nvp, zpool_prop_to_name(ZPOOL_PROP_CACHEFILE), 651 &cachefile) != 0) 652 return; 653 654 dp = kmem_alloc(sizeof (spa_config_dirent_t), 655 KM_SLEEP); 656 657 if (cachefile[0] == '\0') 658 dp->scd_path = spa_strdup(spa_config_path); 659 else if (strcmp(cachefile, "none") == 0) 660 dp->scd_path = NULL; 661 else 662 dp->scd_path = spa_strdup(cachefile); 663 664 list_insert_head(&spa->spa_config_list, dp); 665 if (need_sync) 666 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 667} 668 669int 670spa_prop_set(spa_t *spa, nvlist_t *nvp) 671{ 672 int error; 673 nvpair_t *elem = NULL; 674 boolean_t need_sync = B_FALSE; 675 676 if ((error = spa_prop_validate(spa, nvp)) != 0) 677 return (error); 678 679 while ((elem = nvlist_next_nvpair(nvp, elem)) != NULL) { 680 zpool_prop_t prop = zpool_name_to_prop(nvpair_name(elem)); 681 682 if (prop == ZPOOL_PROP_CACHEFILE || 683 prop == ZPOOL_PROP_ALTROOT || 684 prop == ZPOOL_PROP_READONLY) 685 continue; 686 687 if (prop == ZPOOL_PROP_VERSION || prop == ZPROP_INVAL) { 688 uint64_t ver; 689 690 if (prop == ZPOOL_PROP_VERSION) { 691 VERIFY(nvpair_value_uint64(elem, &ver) == 0); 692 } else { 693 ASSERT(zpool_prop_feature(nvpair_name(elem))); 694 ver = SPA_VERSION_FEATURES; 695 need_sync = B_TRUE; 696 } 697 698 /* Save time if the version is already set. */ 699 if (ver == spa_version(spa)) 700 continue; 701 702 /* 703 * In addition to the pool directory object, we might 704 * create the pool properties object, the features for 705 * read object, the features for write object, or the 706 * feature descriptions object. 707 */ 708 error = dsl_sync_task(spa->spa_name, NULL, 709 spa_sync_version, &ver, 710 6, ZFS_SPACE_CHECK_RESERVED); 711 if (error) 712 return (error); 713 continue; 714 } 715 716 need_sync = B_TRUE; 717 break; 718 } 719 720 if (need_sync) { 721 return (dsl_sync_task(spa->spa_name, NULL, spa_sync_props, 722 nvp, 6, ZFS_SPACE_CHECK_RESERVED)); 723 } 724 725 return (0); 726} 727 728/* 729 * If the bootfs property value is dsobj, clear it. 730 */ 731void 732spa_prop_clear_bootfs(spa_t *spa, uint64_t dsobj, dmu_tx_t *tx) 733{ 734 if (spa->spa_bootfs == dsobj && spa->spa_pool_props_object != 0) { 735 VERIFY(zap_remove(spa->spa_meta_objset, 736 spa->spa_pool_props_object, 737 zpool_prop_to_name(ZPOOL_PROP_BOOTFS), tx) == 0); 738 spa->spa_bootfs = 0; 739 } 740} 741 742/*ARGSUSED*/ 743static int 744spa_change_guid_check(void *arg, dmu_tx_t *tx) 745{ 746 uint64_t *newguid = arg; 747 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 748 vdev_t *rvd = spa->spa_root_vdev; 749 uint64_t vdev_state; 750 751 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 752 vdev_state = rvd->vdev_state; 753 spa_config_exit(spa, SCL_STATE, FTAG); 754 755 if (vdev_state != VDEV_STATE_HEALTHY) 756 return (SET_ERROR(ENXIO)); 757 758 ASSERT3U(spa_guid(spa), !=, *newguid); 759 760 return (0); 761} 762 763static void 764spa_change_guid_sync(void *arg, dmu_tx_t *tx) 765{ 766 uint64_t *newguid = arg; 767 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 768 uint64_t oldguid; 769 vdev_t *rvd = spa->spa_root_vdev; 770 771 oldguid = spa_guid(spa); 772 773 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 774 rvd->vdev_guid = *newguid; 775 rvd->vdev_guid_sum += (*newguid - oldguid); 776 vdev_config_dirty(rvd); 777 spa_config_exit(spa, SCL_STATE, FTAG); 778 779 spa_history_log_internal(spa, "guid change", tx, "old=%llu new=%llu", 780 oldguid, *newguid); 781} 782 783/* 784 * Change the GUID for the pool. This is done so that we can later 785 * re-import a pool built from a clone of our own vdevs. We will modify 786 * the root vdev's guid, our own pool guid, and then mark all of our 787 * vdevs dirty. Note that we must make sure that all our vdevs are 788 * online when we do this, or else any vdevs that weren't present 789 * would be orphaned from our pool. We are also going to issue a 790 * sysevent to update any watchers. 791 */ 792int 793spa_change_guid(spa_t *spa) 794{ 795 int error; 796 uint64_t guid; 797 798 mutex_enter(&spa->spa_vdev_top_lock); 799 mutex_enter(&spa_namespace_lock); 800 guid = spa_generate_guid(NULL); 801 802 error = dsl_sync_task(spa->spa_name, spa_change_guid_check, 803 spa_change_guid_sync, &guid, 5, ZFS_SPACE_CHECK_RESERVED); 804 805 if (error == 0) { 806 spa_config_sync(spa, B_FALSE, B_TRUE); 807 spa_event_notify(spa, NULL, ESC_ZFS_POOL_REGUID); 808 } 809 810 mutex_exit(&spa_namespace_lock); 811 mutex_exit(&spa->spa_vdev_top_lock); 812 813 return (error); 814} 815 816/* 817 * ========================================================================== 818 * SPA state manipulation (open/create/destroy/import/export) 819 * ========================================================================== 820 */ 821 822static int 823spa_error_entry_compare(const void *a, const void *b) 824{ 825 spa_error_entry_t *sa = (spa_error_entry_t *)a; 826 spa_error_entry_t *sb = (spa_error_entry_t *)b; 827 int ret; 828 829 ret = bcmp(&sa->se_bookmark, &sb->se_bookmark, 830 sizeof (zbookmark_phys_t)); 831 832 if (ret < 0) 833 return (-1); 834 else if (ret > 0) 835 return (1); 836 else 837 return (0); 838} 839 840/* 841 * Utility function which retrieves copies of the current logs and 842 * re-initializes them in the process. 843 */ 844void 845spa_get_errlists(spa_t *spa, avl_tree_t *last, avl_tree_t *scrub) 846{ 847 ASSERT(MUTEX_HELD(&spa->spa_errlist_lock)); 848 849 bcopy(&spa->spa_errlist_last, last, sizeof (avl_tree_t)); 850 bcopy(&spa->spa_errlist_scrub, scrub, sizeof (avl_tree_t)); 851 852 avl_create(&spa->spa_errlist_scrub, 853 spa_error_entry_compare, sizeof (spa_error_entry_t), 854 offsetof(spa_error_entry_t, se_avl)); 855 avl_create(&spa->spa_errlist_last, 856 spa_error_entry_compare, sizeof (spa_error_entry_t), 857 offsetof(spa_error_entry_t, se_avl)); 858} 859 860static void 861spa_taskqs_init(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 862{ 863 const zio_taskq_info_t *ztip = &zio_taskqs[t][q]; 864 enum zti_modes mode = ztip->zti_mode; 865 uint_t value = ztip->zti_value; 866 uint_t count = ztip->zti_count; 867 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 868 char name[32]; 869 uint_t flags = 0; 870 boolean_t batch = B_FALSE; 871 872 if (mode == ZTI_MODE_NULL) { 873 tqs->stqs_count = 0; 874 tqs->stqs_taskq = NULL; 875 return; 876 } 877 878 ASSERT3U(count, >, 0); 879 880 tqs->stqs_count = count; 881 tqs->stqs_taskq = kmem_alloc(count * sizeof (taskq_t *), KM_SLEEP); 882 883 switch (mode) { 884 case ZTI_MODE_FIXED: 885 ASSERT3U(value, >=, 1); 886 value = MAX(value, 1); 887 break; 888 889 case ZTI_MODE_BATCH: 890 batch = B_TRUE; 891 flags |= TASKQ_THREADS_CPU_PCT; 892 value = zio_taskq_batch_pct; 893 break; 894 895 default: 896 panic("unrecognized mode for %s_%s taskq (%u:%u) in " 897 "spa_activate()", 898 zio_type_name[t], zio_taskq_types[q], mode, value); 899 break; 900 } 901 902 for (uint_t i = 0; i < count; i++) { 903 taskq_t *tq; 904 905 if (count > 1) { 906 (void) snprintf(name, sizeof (name), "%s_%s_%u", 907 zio_type_name[t], zio_taskq_types[q], i); 908 } else { 909 (void) snprintf(name, sizeof (name), "%s_%s", 910 zio_type_name[t], zio_taskq_types[q]); 911 } 912 913#ifdef SYSDC 914 if (zio_taskq_sysdc && spa->spa_proc != &p0) { 915 if (batch) 916 flags |= TASKQ_DC_BATCH; 917 918 tq = taskq_create_sysdc(name, value, 50, INT_MAX, 919 spa->spa_proc, zio_taskq_basedc, flags); 920 } else { 921#endif 922 pri_t pri = maxclsyspri; 923 /* 924 * The write issue taskq can be extremely CPU 925 * intensive. Run it at slightly lower priority 926 * than the other taskqs. 927 */ 928 if (t == ZIO_TYPE_WRITE && q == ZIO_TASKQ_ISSUE) 929 pri--; 930 931 tq = taskq_create_proc(name, value, pri, 50, 932 INT_MAX, spa->spa_proc, flags); 933#ifdef SYSDC 934 } 935#endif 936 937 tqs->stqs_taskq[i] = tq; 938 } 939} 940 941static void 942spa_taskqs_fini(spa_t *spa, zio_type_t t, zio_taskq_type_t q) 943{ 944 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 945 946 if (tqs->stqs_taskq == NULL) { 947 ASSERT0(tqs->stqs_count); 948 return; 949 } 950 951 for (uint_t i = 0; i < tqs->stqs_count; i++) { 952 ASSERT3P(tqs->stqs_taskq[i], !=, NULL); 953 taskq_destroy(tqs->stqs_taskq[i]); 954 } 955 956 kmem_free(tqs->stqs_taskq, tqs->stqs_count * sizeof (taskq_t *)); 957 tqs->stqs_taskq = NULL; 958} 959 960/* 961 * Dispatch a task to the appropriate taskq for the ZFS I/O type and priority. 962 * Note that a type may have multiple discrete taskqs to avoid lock contention 963 * on the taskq itself. In that case we choose which taskq at random by using 964 * the low bits of gethrtime(). 965 */ 966void 967spa_taskq_dispatch_ent(spa_t *spa, zio_type_t t, zio_taskq_type_t q, 968 task_func_t *func, void *arg, uint_t flags, taskq_ent_t *ent) 969{ 970 spa_taskqs_t *tqs = &spa->spa_zio_taskq[t][q]; 971 taskq_t *tq; 972 973 ASSERT3P(tqs->stqs_taskq, !=, NULL); 974 ASSERT3U(tqs->stqs_count, !=, 0); 975 976 if (tqs->stqs_count == 1) { 977 tq = tqs->stqs_taskq[0]; 978 } else { 979#ifdef _KERNEL 980 tq = tqs->stqs_taskq[cpu_ticks() % tqs->stqs_count]; 981#else 982 tq = tqs->stqs_taskq[gethrtime() % tqs->stqs_count]; 983#endif 984 } 985 986 taskq_dispatch_ent(tq, func, arg, flags, ent); 987} 988 989static void 990spa_create_zio_taskqs(spa_t *spa) 991{ 992 for (int t = 0; t < ZIO_TYPES; t++) { 993 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 994 spa_taskqs_init(spa, t, q); 995 } 996 } 997} 998 999#ifdef _KERNEL 1000#ifdef SPA_PROCESS 1001static void 1002spa_thread(void *arg) 1003{ 1004 callb_cpr_t cprinfo; 1005 1006 spa_t *spa = arg; 1007 user_t *pu = PTOU(curproc); 1008 1009 CALLB_CPR_INIT(&cprinfo, &spa->spa_proc_lock, callb_generic_cpr, 1010 spa->spa_name); 1011 1012 ASSERT(curproc != &p0); 1013 (void) snprintf(pu->u_psargs, sizeof (pu->u_psargs), 1014 "zpool-%s", spa->spa_name); 1015 (void) strlcpy(pu->u_comm, pu->u_psargs, sizeof (pu->u_comm)); 1016 1017#ifdef PSRSET_BIND 1018 /* bind this thread to the requested psrset */ 1019 if (zio_taskq_psrset_bind != PS_NONE) { 1020 pool_lock(); 1021 mutex_enter(&cpu_lock); 1022 mutex_enter(&pidlock); 1023 mutex_enter(&curproc->p_lock); 1024 1025 if (cpupart_bind_thread(curthread, zio_taskq_psrset_bind, 1026 0, NULL, NULL) == 0) { 1027 curthread->t_bind_pset = zio_taskq_psrset_bind; 1028 } else { 1029 cmn_err(CE_WARN, 1030 "Couldn't bind process for zfs pool \"%s\" to " 1031 "pset %d\n", spa->spa_name, zio_taskq_psrset_bind); 1032 } 1033 1034 mutex_exit(&curproc->p_lock); 1035 mutex_exit(&pidlock); 1036 mutex_exit(&cpu_lock); 1037 pool_unlock(); 1038 } 1039#endif 1040 1041#ifdef SYSDC 1042 if (zio_taskq_sysdc) { 1043 sysdc_thread_enter(curthread, 100, 0); 1044 } 1045#endif 1046 1047 spa->spa_proc = curproc; 1048 spa->spa_did = curthread->t_did; 1049 1050 spa_create_zio_taskqs(spa); 1051 1052 mutex_enter(&spa->spa_proc_lock); 1053 ASSERT(spa->spa_proc_state == SPA_PROC_CREATED); 1054 1055 spa->spa_proc_state = SPA_PROC_ACTIVE; 1056 cv_broadcast(&spa->spa_proc_cv); 1057 1058 CALLB_CPR_SAFE_BEGIN(&cprinfo); 1059 while (spa->spa_proc_state == SPA_PROC_ACTIVE) 1060 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1061 CALLB_CPR_SAFE_END(&cprinfo, &spa->spa_proc_lock); 1062 1063 ASSERT(spa->spa_proc_state == SPA_PROC_DEACTIVATE); 1064 spa->spa_proc_state = SPA_PROC_GONE; 1065 spa->spa_proc = &p0; 1066 cv_broadcast(&spa->spa_proc_cv); 1067 CALLB_CPR_EXIT(&cprinfo); /* drops spa_proc_lock */ 1068 1069 mutex_enter(&curproc->p_lock); 1070 lwp_exit(); 1071} 1072#endif /* SPA_PROCESS */ 1073#endif 1074 1075/* 1076 * Activate an uninitialized pool. 1077 */ 1078static void 1079spa_activate(spa_t *spa, int mode) 1080{ 1081 ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED); 1082 1083 spa->spa_state = POOL_STATE_ACTIVE; 1084 spa->spa_mode = mode; 1085 1086 spa->spa_normal_class = metaslab_class_create(spa, zfs_metaslab_ops); 1087 spa->spa_log_class = metaslab_class_create(spa, zfs_metaslab_ops); 1088 1089 /* Try to create a covering process */ 1090 mutex_enter(&spa->spa_proc_lock); 1091 ASSERT(spa->spa_proc_state == SPA_PROC_NONE); 1092 ASSERT(spa->spa_proc == &p0); 1093 spa->spa_did = 0; 1094 1095#ifdef SPA_PROCESS 1096 /* Only create a process if we're going to be around a while. */ 1097 if (spa_create_process && strcmp(spa->spa_name, TRYIMPORT_NAME) != 0) { 1098 if (newproc(spa_thread, (caddr_t)spa, syscid, maxclsyspri, 1099 NULL, 0) == 0) { 1100 spa->spa_proc_state = SPA_PROC_CREATED; 1101 while (spa->spa_proc_state == SPA_PROC_CREATED) { 1102 cv_wait(&spa->spa_proc_cv, 1103 &spa->spa_proc_lock); 1104 } 1105 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1106 ASSERT(spa->spa_proc != &p0); 1107 ASSERT(spa->spa_did != 0); 1108 } else { 1109#ifdef _KERNEL 1110 cmn_err(CE_WARN, 1111 "Couldn't create process for zfs pool \"%s\"\n", 1112 spa->spa_name); 1113#endif 1114 } 1115 } 1116#endif /* SPA_PROCESS */ 1117 mutex_exit(&spa->spa_proc_lock); 1118 1119 /* If we didn't create a process, we need to create our taskqs. */ 1120 ASSERT(spa->spa_proc == &p0); 1121 if (spa->spa_proc == &p0) { 1122 spa_create_zio_taskqs(spa); 1123 } 1124 1125 /* 1126 * Start TRIM thread. 1127 */ 1128 trim_thread_create(spa); 1129 1130 list_create(&spa->spa_config_dirty_list, sizeof (vdev_t), 1131 offsetof(vdev_t, vdev_config_dirty_node)); 1132 list_create(&spa->spa_evicting_os_list, sizeof (objset_t), 1133 offsetof(objset_t, os_evicting_node)); 1134 list_create(&spa->spa_state_dirty_list, sizeof (vdev_t), 1135 offsetof(vdev_t, vdev_state_dirty_node)); 1136 1137 txg_list_create(&spa->spa_vdev_txg_list, 1138 offsetof(struct vdev, vdev_txg_node)); 1139 1140 avl_create(&spa->spa_errlist_scrub, 1141 spa_error_entry_compare, sizeof (spa_error_entry_t), 1142 offsetof(spa_error_entry_t, se_avl)); 1143 avl_create(&spa->spa_errlist_last, 1144 spa_error_entry_compare, sizeof (spa_error_entry_t), 1145 offsetof(spa_error_entry_t, se_avl)); 1146} 1147 1148/* 1149 * Opposite of spa_activate(). 1150 */ 1151static void 1152spa_deactivate(spa_t *spa) 1153{ 1154 ASSERT(spa->spa_sync_on == B_FALSE); 1155 ASSERT(spa->spa_dsl_pool == NULL); 1156 ASSERT(spa->spa_root_vdev == NULL); 1157 ASSERT(spa->spa_async_zio_root == NULL); 1158 ASSERT(spa->spa_state != POOL_STATE_UNINITIALIZED); 1159 1160 /* 1161 * Stop TRIM thread in case spa_unload() wasn't called directly 1162 * before spa_deactivate(). 1163 */ 1164 trim_thread_destroy(spa); 1165 1166 spa_evicting_os_wait(spa); 1167 1168 txg_list_destroy(&spa->spa_vdev_txg_list); 1169 1170 list_destroy(&spa->spa_config_dirty_list); 1171 list_destroy(&spa->spa_evicting_os_list); 1172 list_destroy(&spa->spa_state_dirty_list); 1173 1174 for (int t = 0; t < ZIO_TYPES; t++) { 1175 for (int q = 0; q < ZIO_TASKQ_TYPES; q++) { 1176 spa_taskqs_fini(spa, t, q); 1177 } 1178 } 1179 1180 metaslab_class_destroy(spa->spa_normal_class); 1181 spa->spa_normal_class = NULL; 1182 1183 metaslab_class_destroy(spa->spa_log_class); 1184 spa->spa_log_class = NULL; 1185 1186 /* 1187 * If this was part of an import or the open otherwise failed, we may 1188 * still have errors left in the queues. Empty them just in case. 1189 */ 1190 spa_errlog_drain(spa); 1191 1192 avl_destroy(&spa->spa_errlist_scrub); 1193 avl_destroy(&spa->spa_errlist_last); 1194 1195 spa->spa_state = POOL_STATE_UNINITIALIZED; 1196 1197 mutex_enter(&spa->spa_proc_lock); 1198 if (spa->spa_proc_state != SPA_PROC_NONE) { 1199 ASSERT(spa->spa_proc_state == SPA_PROC_ACTIVE); 1200 spa->spa_proc_state = SPA_PROC_DEACTIVATE; 1201 cv_broadcast(&spa->spa_proc_cv); 1202 while (spa->spa_proc_state == SPA_PROC_DEACTIVATE) { 1203 ASSERT(spa->spa_proc != &p0); 1204 cv_wait(&spa->spa_proc_cv, &spa->spa_proc_lock); 1205 } 1206 ASSERT(spa->spa_proc_state == SPA_PROC_GONE); 1207 spa->spa_proc_state = SPA_PROC_NONE; 1208 } 1209 ASSERT(spa->spa_proc == &p0); 1210 mutex_exit(&spa->spa_proc_lock); 1211 1212#ifdef SPA_PROCESS 1213 /* 1214 * We want to make sure spa_thread() has actually exited the ZFS 1215 * module, so that the module can't be unloaded out from underneath 1216 * it. 1217 */ 1218 if (spa->spa_did != 0) { 1219 thread_join(spa->spa_did); 1220 spa->spa_did = 0; 1221 } 1222#endif /* SPA_PROCESS */ 1223} 1224 1225/* 1226 * Verify a pool configuration, and construct the vdev tree appropriately. This 1227 * will create all the necessary vdevs in the appropriate layout, with each vdev 1228 * in the CLOSED state. This will prep the pool before open/creation/import. 1229 * All vdev validation is done by the vdev_alloc() routine. 1230 */ 1231static int 1232spa_config_parse(spa_t *spa, vdev_t **vdp, nvlist_t *nv, vdev_t *parent, 1233 uint_t id, int atype) 1234{ 1235 nvlist_t **child; 1236 uint_t children; 1237 int error; 1238 1239 if ((error = vdev_alloc(spa, vdp, nv, parent, id, atype)) != 0) 1240 return (error); 1241 1242 if ((*vdp)->vdev_ops->vdev_op_leaf) 1243 return (0); 1244 1245 error = nvlist_lookup_nvlist_array(nv, ZPOOL_CONFIG_CHILDREN, 1246 &child, &children); 1247 1248 if (error == ENOENT) 1249 return (0); 1250 1251 if (error) { 1252 vdev_free(*vdp); 1253 *vdp = NULL; 1254 return (SET_ERROR(EINVAL)); 1255 } 1256 1257 for (int c = 0; c < children; c++) { 1258 vdev_t *vd; 1259 if ((error = spa_config_parse(spa, &vd, child[c], *vdp, c, 1260 atype)) != 0) { 1261 vdev_free(*vdp); 1262 *vdp = NULL; 1263 return (error); 1264 } 1265 } 1266 1267 ASSERT(*vdp != NULL); 1268 1269 return (0); 1270} 1271 1272/* 1273 * Opposite of spa_load(). 1274 */ 1275static void 1276spa_unload(spa_t *spa) 1277{ 1278 int i; 1279 1280 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 1281 1282 /* 1283 * Stop TRIM thread. 1284 */ 1285 trim_thread_destroy(spa); 1286 1287 /* 1288 * Stop async tasks. 1289 */ 1290 spa_async_suspend(spa); 1291 1292 /* 1293 * Stop syncing. 1294 */ 1295 if (spa->spa_sync_on) { 1296 txg_sync_stop(spa->spa_dsl_pool); 1297 spa->spa_sync_on = B_FALSE; 1298 } 1299 1300 /* 1301 * Wait for any outstanding async I/O to complete. 1302 */ 1303 if (spa->spa_async_zio_root != NULL) { 1304 for (int i = 0; i < max_ncpus; i++) 1305 (void) zio_wait(spa->spa_async_zio_root[i]); 1306 kmem_free(spa->spa_async_zio_root, max_ncpus * sizeof (void *)); 1307 spa->spa_async_zio_root = NULL; 1308 } 1309 1310 bpobj_close(&spa->spa_deferred_bpobj); 1311 1312 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1313 1314 /* 1315 * Close all vdevs. 1316 */ 1317 if (spa->spa_root_vdev) 1318 vdev_free(spa->spa_root_vdev); 1319 ASSERT(spa->spa_root_vdev == NULL); 1320 1321 /* 1322 * Close the dsl pool. 1323 */ 1324 if (spa->spa_dsl_pool) { 1325 dsl_pool_close(spa->spa_dsl_pool); 1326 spa->spa_dsl_pool = NULL; 1327 spa->spa_meta_objset = NULL; 1328 } 1329 1330 ddt_unload(spa); 1331 1332 1333 /* 1334 * Drop and purge level 2 cache 1335 */ 1336 spa_l2cache_drop(spa); 1337 1338 for (i = 0; i < spa->spa_spares.sav_count; i++) 1339 vdev_free(spa->spa_spares.sav_vdevs[i]); 1340 if (spa->spa_spares.sav_vdevs) { 1341 kmem_free(spa->spa_spares.sav_vdevs, 1342 spa->spa_spares.sav_count * sizeof (void *)); 1343 spa->spa_spares.sav_vdevs = NULL; 1344 } 1345 if (spa->spa_spares.sav_config) { 1346 nvlist_free(spa->spa_spares.sav_config); 1347 spa->spa_spares.sav_config = NULL; 1348 } 1349 spa->spa_spares.sav_count = 0; 1350 1351 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 1352 vdev_clear_stats(spa->spa_l2cache.sav_vdevs[i]); 1353 vdev_free(spa->spa_l2cache.sav_vdevs[i]); 1354 } 1355 if (spa->spa_l2cache.sav_vdevs) { 1356 kmem_free(spa->spa_l2cache.sav_vdevs, 1357 spa->spa_l2cache.sav_count * sizeof (void *)); 1358 spa->spa_l2cache.sav_vdevs = NULL; 1359 } 1360 if (spa->spa_l2cache.sav_config) { 1361 nvlist_free(spa->spa_l2cache.sav_config); 1362 spa->spa_l2cache.sav_config = NULL; 1363 } 1364 spa->spa_l2cache.sav_count = 0; 1365 1366 spa->spa_async_suspended = 0; 1367 1368 if (spa->spa_comment != NULL) { 1369 spa_strfree(spa->spa_comment); 1370 spa->spa_comment = NULL; 1371 } 1372 1373 spa_config_exit(spa, SCL_ALL, FTAG); 1374} 1375 1376/* 1377 * Load (or re-load) the current list of vdevs describing the active spares for 1378 * this pool. When this is called, we have some form of basic information in 1379 * 'spa_spares.sav_config'. We parse this into vdevs, try to open them, and 1380 * then re-generate a more complete list including status information. 1381 */ 1382static void 1383spa_load_spares(spa_t *spa) 1384{ 1385 nvlist_t **spares; 1386 uint_t nspares; 1387 int i; 1388 vdev_t *vd, *tvd; 1389 1390 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1391 1392 /* 1393 * First, close and free any existing spare vdevs. 1394 */ 1395 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1396 vd = spa->spa_spares.sav_vdevs[i]; 1397 1398 /* Undo the call to spa_activate() below */ 1399 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1400 B_FALSE)) != NULL && tvd->vdev_isspare) 1401 spa_spare_remove(tvd); 1402 vdev_close(vd); 1403 vdev_free(vd); 1404 } 1405 1406 if (spa->spa_spares.sav_vdevs) 1407 kmem_free(spa->spa_spares.sav_vdevs, 1408 spa->spa_spares.sav_count * sizeof (void *)); 1409 1410 if (spa->spa_spares.sav_config == NULL) 1411 nspares = 0; 1412 else 1413 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 1414 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 1415 1416 spa->spa_spares.sav_count = (int)nspares; 1417 spa->spa_spares.sav_vdevs = NULL; 1418 1419 if (nspares == 0) 1420 return; 1421 1422 /* 1423 * Construct the array of vdevs, opening them to get status in the 1424 * process. For each spare, there is potentially two different vdev_t 1425 * structures associated with it: one in the list of spares (used only 1426 * for basic validation purposes) and one in the active vdev 1427 * configuration (if it's spared in). During this phase we open and 1428 * validate each vdev on the spare list. If the vdev also exists in the 1429 * active configuration, then we also mark this vdev as an active spare. 1430 */ 1431 spa->spa_spares.sav_vdevs = kmem_alloc(nspares * sizeof (void *), 1432 KM_SLEEP); 1433 for (i = 0; i < spa->spa_spares.sav_count; i++) { 1434 VERIFY(spa_config_parse(spa, &vd, spares[i], NULL, 0, 1435 VDEV_ALLOC_SPARE) == 0); 1436 ASSERT(vd != NULL); 1437 1438 spa->spa_spares.sav_vdevs[i] = vd; 1439 1440 if ((tvd = spa_lookup_by_guid(spa, vd->vdev_guid, 1441 B_FALSE)) != NULL) { 1442 if (!tvd->vdev_isspare) 1443 spa_spare_add(tvd); 1444 1445 /* 1446 * We only mark the spare active if we were successfully 1447 * able to load the vdev. Otherwise, importing a pool 1448 * with a bad active spare would result in strange 1449 * behavior, because multiple pool would think the spare 1450 * is actively in use. 1451 * 1452 * There is a vulnerability here to an equally bizarre 1453 * circumstance, where a dead active spare is later 1454 * brought back to life (onlined or otherwise). Given 1455 * the rarity of this scenario, and the extra complexity 1456 * it adds, we ignore the possibility. 1457 */ 1458 if (!vdev_is_dead(tvd)) 1459 spa_spare_activate(tvd); 1460 } 1461 1462 vd->vdev_top = vd; 1463 vd->vdev_aux = &spa->spa_spares; 1464 1465 if (vdev_open(vd) != 0) 1466 continue; 1467 1468 if (vdev_validate_aux(vd) == 0) 1469 spa_spare_add(vd); 1470 } 1471 1472 /* 1473 * Recompute the stashed list of spares, with status information 1474 * this time. 1475 */ 1476 VERIFY(nvlist_remove(spa->spa_spares.sav_config, ZPOOL_CONFIG_SPARES, 1477 DATA_TYPE_NVLIST_ARRAY) == 0); 1478 1479 spares = kmem_alloc(spa->spa_spares.sav_count * sizeof (void *), 1480 KM_SLEEP); 1481 for (i = 0; i < spa->spa_spares.sav_count; i++) 1482 spares[i] = vdev_config_generate(spa, 1483 spa->spa_spares.sav_vdevs[i], B_TRUE, VDEV_CONFIG_SPARE); 1484 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 1485 ZPOOL_CONFIG_SPARES, spares, spa->spa_spares.sav_count) == 0); 1486 for (i = 0; i < spa->spa_spares.sav_count; i++) 1487 nvlist_free(spares[i]); 1488 kmem_free(spares, spa->spa_spares.sav_count * sizeof (void *)); 1489} 1490 1491/* 1492 * Load (or re-load) the current list of vdevs describing the active l2cache for 1493 * this pool. When this is called, we have some form of basic information in 1494 * 'spa_l2cache.sav_config'. We parse this into vdevs, try to open them, and 1495 * then re-generate a more complete list including status information. 1496 * Devices which are already active have their details maintained, and are 1497 * not re-opened. 1498 */ 1499static void 1500spa_load_l2cache(spa_t *spa) 1501{ 1502 nvlist_t **l2cache; 1503 uint_t nl2cache; 1504 int i, j, oldnvdevs; 1505 uint64_t guid; 1506 vdev_t *vd, **oldvdevs, **newvdevs; 1507 spa_aux_vdev_t *sav = &spa->spa_l2cache; 1508 1509 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 1510 1511 if (sav->sav_config != NULL) { 1512 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, 1513 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 1514 newvdevs = kmem_alloc(nl2cache * sizeof (void *), KM_SLEEP); 1515 } else { 1516 nl2cache = 0; 1517 newvdevs = NULL; 1518 } 1519 1520 oldvdevs = sav->sav_vdevs; 1521 oldnvdevs = sav->sav_count; 1522 sav->sav_vdevs = NULL; 1523 sav->sav_count = 0; 1524 1525 /* 1526 * Process new nvlist of vdevs. 1527 */ 1528 for (i = 0; i < nl2cache; i++) { 1529 VERIFY(nvlist_lookup_uint64(l2cache[i], ZPOOL_CONFIG_GUID, 1530 &guid) == 0); 1531 1532 newvdevs[i] = NULL; 1533 for (j = 0; j < oldnvdevs; j++) { 1534 vd = oldvdevs[j]; 1535 if (vd != NULL && guid == vd->vdev_guid) { 1536 /* 1537 * Retain previous vdev for add/remove ops. 1538 */ 1539 newvdevs[i] = vd; 1540 oldvdevs[j] = NULL; 1541 break; 1542 } 1543 } 1544 1545 if (newvdevs[i] == NULL) { 1546 /* 1547 * Create new vdev 1548 */ 1549 VERIFY(spa_config_parse(spa, &vd, l2cache[i], NULL, 0, 1550 VDEV_ALLOC_L2CACHE) == 0); 1551 ASSERT(vd != NULL); 1552 newvdevs[i] = vd; 1553 1554 /* 1555 * Commit this vdev as an l2cache device, 1556 * even if it fails to open. 1557 */ 1558 spa_l2cache_add(vd); 1559 1560 vd->vdev_top = vd; 1561 vd->vdev_aux = sav; 1562 1563 spa_l2cache_activate(vd); 1564 1565 if (vdev_open(vd) != 0) 1566 continue; 1567 1568 (void) vdev_validate_aux(vd); 1569 1570 if (!vdev_is_dead(vd)) 1571 l2arc_add_vdev(spa, vd); 1572 } 1573 } 1574 1575 /* 1576 * Purge vdevs that were dropped 1577 */ 1578 for (i = 0; i < oldnvdevs; i++) { 1579 uint64_t pool; 1580 1581 vd = oldvdevs[i]; 1582 if (vd != NULL) { 1583 ASSERT(vd->vdev_isl2cache); 1584 1585 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 1586 pool != 0ULL && l2arc_vdev_present(vd)) 1587 l2arc_remove_vdev(vd); 1588 vdev_clear_stats(vd); 1589 vdev_free(vd); 1590 } 1591 } 1592 1593 if (oldvdevs) 1594 kmem_free(oldvdevs, oldnvdevs * sizeof (void *)); 1595 1596 if (sav->sav_config == NULL) 1597 goto out; 1598 1599 sav->sav_vdevs = newvdevs; 1600 sav->sav_count = (int)nl2cache; 1601 1602 /* 1603 * Recompute the stashed list of l2cache devices, with status 1604 * information this time. 1605 */ 1606 VERIFY(nvlist_remove(sav->sav_config, ZPOOL_CONFIG_L2CACHE, 1607 DATA_TYPE_NVLIST_ARRAY) == 0); 1608 1609 l2cache = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 1610 for (i = 0; i < sav->sav_count; i++) 1611 l2cache[i] = vdev_config_generate(spa, 1612 sav->sav_vdevs[i], B_TRUE, VDEV_CONFIG_L2CACHE); 1613 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 1614 ZPOOL_CONFIG_L2CACHE, l2cache, sav->sav_count) == 0); 1615out: 1616 for (i = 0; i < sav->sav_count; i++) 1617 nvlist_free(l2cache[i]); 1618 if (sav->sav_count) 1619 kmem_free(l2cache, sav->sav_count * sizeof (void *)); 1620} 1621 1622static int 1623load_nvlist(spa_t *spa, uint64_t obj, nvlist_t **value) 1624{ 1625 dmu_buf_t *db; 1626 char *packed = NULL; 1627 size_t nvsize = 0; 1628 int error; 1629 *value = NULL; 1630 1631 error = dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db); 1632 if (error != 0) 1633 return (error); 1634 1635 nvsize = *(uint64_t *)db->db_data; 1636 dmu_buf_rele(db, FTAG); 1637 1638 packed = kmem_alloc(nvsize, KM_SLEEP); 1639 error = dmu_read(spa->spa_meta_objset, obj, 0, nvsize, packed, 1640 DMU_READ_PREFETCH); 1641 if (error == 0) 1642 error = nvlist_unpack(packed, nvsize, value, 0); 1643 kmem_free(packed, nvsize); 1644 1645 return (error); 1646} 1647 1648/* 1649 * Checks to see if the given vdev could not be opened, in which case we post a 1650 * sysevent to notify the autoreplace code that the device has been removed. 1651 */ 1652static void 1653spa_check_removed(vdev_t *vd) 1654{ 1655 for (int c = 0; c < vd->vdev_children; c++) 1656 spa_check_removed(vd->vdev_child[c]); 1657 1658 if (vd->vdev_ops->vdev_op_leaf && vdev_is_dead(vd) && 1659 !vd->vdev_ishole) { 1660 zfs_post_autoreplace(vd->vdev_spa, vd); 1661 spa_event_notify(vd->vdev_spa, vd, ESC_ZFS_VDEV_CHECK); 1662 } 1663} 1664 1665/* 1666 * Validate the current config against the MOS config 1667 */ 1668static boolean_t 1669spa_config_valid(spa_t *spa, nvlist_t *config) 1670{ 1671 vdev_t *mrvd, *rvd = spa->spa_root_vdev; 1672 nvlist_t *nv; 1673 1674 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nv) == 0); 1675 1676 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1677 VERIFY(spa_config_parse(spa, &mrvd, nv, NULL, 0, VDEV_ALLOC_LOAD) == 0); 1678 1679 ASSERT3U(rvd->vdev_children, ==, mrvd->vdev_children); 1680 1681 /* 1682 * If we're doing a normal import, then build up any additional 1683 * diagnostic information about missing devices in this config. 1684 * We'll pass this up to the user for further processing. 1685 */ 1686 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) { 1687 nvlist_t **child, *nv; 1688 uint64_t idx = 0; 1689 1690 child = kmem_alloc(rvd->vdev_children * sizeof (nvlist_t **), 1691 KM_SLEEP); 1692 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1693 1694 for (int c = 0; c < rvd->vdev_children; c++) { 1695 vdev_t *tvd = rvd->vdev_child[c]; 1696 vdev_t *mtvd = mrvd->vdev_child[c]; 1697 1698 if (tvd->vdev_ops == &vdev_missing_ops && 1699 mtvd->vdev_ops != &vdev_missing_ops && 1700 mtvd->vdev_islog) 1701 child[idx++] = vdev_config_generate(spa, mtvd, 1702 B_FALSE, 0); 1703 } 1704 1705 if (idx) { 1706 VERIFY(nvlist_add_nvlist_array(nv, 1707 ZPOOL_CONFIG_CHILDREN, child, idx) == 0); 1708 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 1709 ZPOOL_CONFIG_MISSING_DEVICES, nv) == 0); 1710 1711 for (int i = 0; i < idx; i++) 1712 nvlist_free(child[i]); 1713 } 1714 nvlist_free(nv); 1715 kmem_free(child, rvd->vdev_children * sizeof (char **)); 1716 } 1717 1718 /* 1719 * Compare the root vdev tree with the information we have 1720 * from the MOS config (mrvd). Check each top-level vdev 1721 * with the corresponding MOS config top-level (mtvd). 1722 */ 1723 for (int c = 0; c < rvd->vdev_children; c++) { 1724 vdev_t *tvd = rvd->vdev_child[c]; 1725 vdev_t *mtvd = mrvd->vdev_child[c]; 1726 1727 /* 1728 * Resolve any "missing" vdevs in the current configuration. 1729 * If we find that the MOS config has more accurate information 1730 * about the top-level vdev then use that vdev instead. 1731 */ 1732 if (tvd->vdev_ops == &vdev_missing_ops && 1733 mtvd->vdev_ops != &vdev_missing_ops) { 1734 1735 if (!(spa->spa_import_flags & ZFS_IMPORT_MISSING_LOG)) 1736 continue; 1737 1738 /* 1739 * Device specific actions. 1740 */ 1741 if (mtvd->vdev_islog) { 1742 spa_set_log_state(spa, SPA_LOG_CLEAR); 1743 } else { 1744 /* 1745 * XXX - once we have 'readonly' pool 1746 * support we should be able to handle 1747 * missing data devices by transitioning 1748 * the pool to readonly. 1749 */ 1750 continue; 1751 } 1752 1753 /* 1754 * Swap the missing vdev with the data we were 1755 * able to obtain from the MOS config. 1756 */ 1757 vdev_remove_child(rvd, tvd); 1758 vdev_remove_child(mrvd, mtvd); 1759 1760 vdev_add_child(rvd, mtvd); 1761 vdev_add_child(mrvd, tvd); 1762 1763 spa_config_exit(spa, SCL_ALL, FTAG); 1764 vdev_load(mtvd); 1765 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 1766 1767 vdev_reopen(rvd); 1768 } else if (mtvd->vdev_islog) { 1769 /* 1770 * Load the slog device's state from the MOS config 1771 * since it's possible that the label does not 1772 * contain the most up-to-date information. 1773 */ 1774 vdev_load_log_state(tvd, mtvd); 1775 vdev_reopen(tvd); 1776 } 1777 } 1778 vdev_free(mrvd); 1779 spa_config_exit(spa, SCL_ALL, FTAG); 1780 1781 /* 1782 * Ensure we were able to validate the config. 1783 */ 1784 return (rvd->vdev_guid_sum == spa->spa_uberblock.ub_guid_sum); 1785} 1786 1787/* 1788 * Check for missing log devices 1789 */ 1790static boolean_t 1791spa_check_logs(spa_t *spa) 1792{ 1793 boolean_t rv = B_FALSE; 1794 dsl_pool_t *dp = spa_get_dsl(spa); 1795 1796 switch (spa->spa_log_state) { 1797 case SPA_LOG_MISSING: 1798 /* need to recheck in case slog has been restored */ 1799 case SPA_LOG_UNKNOWN: 1800 rv = (dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 1801 zil_check_log_chain, NULL, DS_FIND_CHILDREN) != 0); 1802 if (rv) 1803 spa_set_log_state(spa, SPA_LOG_MISSING); 1804 break; 1805 } 1806 return (rv); 1807} 1808 1809static boolean_t 1810spa_passivate_log(spa_t *spa) 1811{ 1812 vdev_t *rvd = spa->spa_root_vdev; 1813 boolean_t slog_found = B_FALSE; 1814 1815 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1816 1817 if (!spa_has_slogs(spa)) 1818 return (B_FALSE); 1819 1820 for (int c = 0; c < rvd->vdev_children; c++) { 1821 vdev_t *tvd = rvd->vdev_child[c]; 1822 metaslab_group_t *mg = tvd->vdev_mg; 1823 1824 if (tvd->vdev_islog) { 1825 metaslab_group_passivate(mg); 1826 slog_found = B_TRUE; 1827 } 1828 } 1829 1830 return (slog_found); 1831} 1832 1833static void 1834spa_activate_log(spa_t *spa) 1835{ 1836 vdev_t *rvd = spa->spa_root_vdev; 1837 1838 ASSERT(spa_config_held(spa, SCL_ALLOC, RW_WRITER)); 1839 1840 for (int c = 0; c < rvd->vdev_children; c++) { 1841 vdev_t *tvd = rvd->vdev_child[c]; 1842 metaslab_group_t *mg = tvd->vdev_mg; 1843 1844 if (tvd->vdev_islog) 1845 metaslab_group_activate(mg); 1846 } 1847} 1848 1849int 1850spa_offline_log(spa_t *spa) 1851{ 1852 int error; 1853 1854 error = dmu_objset_find(spa_name(spa), zil_vdev_offline, 1855 NULL, DS_FIND_CHILDREN); 1856 if (error == 0) { 1857 /* 1858 * We successfully offlined the log device, sync out the 1859 * current txg so that the "stubby" block can be removed 1860 * by zil_sync(). 1861 */ 1862 txg_wait_synced(spa->spa_dsl_pool, 0); 1863 } 1864 return (error); 1865} 1866 1867static void 1868spa_aux_check_removed(spa_aux_vdev_t *sav) 1869{ 1870 int i; 1871 1872 for (i = 0; i < sav->sav_count; i++) 1873 spa_check_removed(sav->sav_vdevs[i]); 1874} 1875 1876void 1877spa_claim_notify(zio_t *zio) 1878{ 1879 spa_t *spa = zio->io_spa; 1880 1881 if (zio->io_error) 1882 return; 1883 1884 mutex_enter(&spa->spa_props_lock); /* any mutex will do */ 1885 if (spa->spa_claim_max_txg < zio->io_bp->blk_birth) 1886 spa->spa_claim_max_txg = zio->io_bp->blk_birth; 1887 mutex_exit(&spa->spa_props_lock); 1888} 1889 1890typedef struct spa_load_error { 1891 uint64_t sle_meta_count; 1892 uint64_t sle_data_count; 1893} spa_load_error_t; 1894 1895static void 1896spa_load_verify_done(zio_t *zio) 1897{ 1898 blkptr_t *bp = zio->io_bp; 1899 spa_load_error_t *sle = zio->io_private; 1900 dmu_object_type_t type = BP_GET_TYPE(bp); 1901 int error = zio->io_error; 1902 spa_t *spa = zio->io_spa; 1903 1904 if (error) { 1905 if ((BP_GET_LEVEL(bp) != 0 || DMU_OT_IS_METADATA(type)) && 1906 type != DMU_OT_INTENT_LOG) 1907 atomic_inc_64(&sle->sle_meta_count); 1908 else 1909 atomic_inc_64(&sle->sle_data_count); 1910 } 1911 zio_data_buf_free(zio->io_data, zio->io_size); 1912 1913 mutex_enter(&spa->spa_scrub_lock); 1914 spa->spa_scrub_inflight--; 1915 cv_broadcast(&spa->spa_scrub_io_cv); 1916 mutex_exit(&spa->spa_scrub_lock); 1917} 1918 1919/* 1920 * Maximum number of concurrent scrub i/os to create while verifying 1921 * a pool while importing it. 1922 */ 1923int spa_load_verify_maxinflight = 10000; 1924boolean_t spa_load_verify_metadata = B_TRUE; 1925boolean_t spa_load_verify_data = B_TRUE; 1926 1927SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_maxinflight, CTLFLAG_RWTUN, 1928 &spa_load_verify_maxinflight, 0, 1929 "Maximum number of concurrent scrub I/Os to create while verifying a " 1930 "pool while importing it"); 1931 1932SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_metadata, CTLFLAG_RWTUN, 1933 &spa_load_verify_metadata, 0, 1934 "Check metadata on import?"); 1935 1936SYSCTL_INT(_vfs_zfs, OID_AUTO, spa_load_verify_data, CTLFLAG_RWTUN, 1937 &spa_load_verify_data, 0, 1938 "Check user data on import?"); 1939 1940/*ARGSUSED*/ 1941static int 1942spa_load_verify_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 1943 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 1944{ 1945 if (bp == NULL || BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp)) 1946 return (0); 1947 /* 1948 * Note: normally this routine will not be called if 1949 * spa_load_verify_metadata is not set. However, it may be useful 1950 * to manually set the flag after the traversal has begun. 1951 */ 1952 if (!spa_load_verify_metadata) 1953 return (0); 1954 if (BP_GET_BUFC_TYPE(bp) == ARC_BUFC_DATA && !spa_load_verify_data) 1955 return (0); 1956 1957 zio_t *rio = arg; 1958 size_t size = BP_GET_PSIZE(bp); 1959 void *data = zio_data_buf_alloc(size); 1960 1961 mutex_enter(&spa->spa_scrub_lock); 1962 while (spa->spa_scrub_inflight >= spa_load_verify_maxinflight) 1963 cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock); 1964 spa->spa_scrub_inflight++; 1965 mutex_exit(&spa->spa_scrub_lock); 1966 1967 zio_nowait(zio_read(rio, spa, bp, data, size, 1968 spa_load_verify_done, rio->io_private, ZIO_PRIORITY_SCRUB, 1969 ZIO_FLAG_SPECULATIVE | ZIO_FLAG_CANFAIL | 1970 ZIO_FLAG_SCRUB | ZIO_FLAG_RAW, zb)); 1971 return (0); 1972} 1973 1974static int 1975spa_load_verify(spa_t *spa) 1976{ 1977 zio_t *rio; 1978 spa_load_error_t sle = { 0 }; 1979 zpool_rewind_policy_t policy; 1980 boolean_t verify_ok = B_FALSE; 1981 int error = 0; 1982 1983 zpool_get_rewind_policy(spa->spa_config, &policy); 1984 1985 if (policy.zrp_request & ZPOOL_NEVER_REWIND) 1986 return (0); 1987 1988 rio = zio_root(spa, NULL, &sle, 1989 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE); 1990 1991 if (spa_load_verify_metadata) { 1992 error = traverse_pool(spa, spa->spa_verify_min_txg, 1993 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, 1994 spa_load_verify_cb, rio); 1995 } 1996 1997 (void) zio_wait(rio); 1998 1999 spa->spa_load_meta_errors = sle.sle_meta_count; 2000 spa->spa_load_data_errors = sle.sle_data_count; 2001 2002 if (!error && sle.sle_meta_count <= policy.zrp_maxmeta && 2003 sle.sle_data_count <= policy.zrp_maxdata) { 2004 int64_t loss = 0; 2005 2006 verify_ok = B_TRUE; 2007 spa->spa_load_txg = spa->spa_uberblock.ub_txg; 2008 spa->spa_load_txg_ts = spa->spa_uberblock.ub_timestamp; 2009 2010 loss = spa->spa_last_ubsync_txg_ts - spa->spa_load_txg_ts; 2011 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2012 ZPOOL_CONFIG_LOAD_TIME, spa->spa_load_txg_ts) == 0); 2013 VERIFY(nvlist_add_int64(spa->spa_load_info, 2014 ZPOOL_CONFIG_REWIND_TIME, loss) == 0); 2015 VERIFY(nvlist_add_uint64(spa->spa_load_info, 2016 ZPOOL_CONFIG_LOAD_DATA_ERRORS, sle.sle_data_count) == 0); 2017 } else { 2018 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg; 2019 } 2020 2021 if (error) { 2022 if (error != ENXIO && error != EIO) 2023 error = SET_ERROR(EIO); 2024 return (error); 2025 } 2026 2027 return (verify_ok ? 0 : EIO); 2028} 2029 2030/* 2031 * Find a value in the pool props object. 2032 */ 2033static void 2034spa_prop_find(spa_t *spa, zpool_prop_t prop, uint64_t *val) 2035{ 2036 (void) zap_lookup(spa->spa_meta_objset, spa->spa_pool_props_object, 2037 zpool_prop_to_name(prop), sizeof (uint64_t), 1, val); 2038} 2039 2040/* 2041 * Find a value in the pool directory object. 2042 */ 2043static int 2044spa_dir_prop(spa_t *spa, const char *name, uint64_t *val) 2045{ 2046 return (zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2047 name, sizeof (uint64_t), 1, val)); 2048} 2049 2050static int 2051spa_vdev_err(vdev_t *vdev, vdev_aux_t aux, int err) 2052{ 2053 vdev_set_state(vdev, B_TRUE, VDEV_STATE_CANT_OPEN, aux); 2054 return (err); 2055} 2056 2057/* 2058 * Fix up config after a partly-completed split. This is done with the 2059 * ZPOOL_CONFIG_SPLIT nvlist. Both the splitting pool and the split-off 2060 * pool have that entry in their config, but only the splitting one contains 2061 * a list of all the guids of the vdevs that are being split off. 2062 * 2063 * This function determines what to do with that list: either rejoin 2064 * all the disks to the pool, or complete the splitting process. To attempt 2065 * the rejoin, each disk that is offlined is marked online again, and 2066 * we do a reopen() call. If the vdev label for every disk that was 2067 * marked online indicates it was successfully split off (VDEV_AUX_SPLIT_POOL) 2068 * then we call vdev_split() on each disk, and complete the split. 2069 * 2070 * Otherwise we leave the config alone, with all the vdevs in place in 2071 * the original pool. 2072 */ 2073static void 2074spa_try_repair(spa_t *spa, nvlist_t *config) 2075{ 2076 uint_t extracted; 2077 uint64_t *glist; 2078 uint_t i, gcount; 2079 nvlist_t *nvl; 2080 vdev_t **vd; 2081 boolean_t attempt_reopen; 2082 2083 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, &nvl) != 0) 2084 return; 2085 2086 /* check that the config is complete */ 2087 if (nvlist_lookup_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 2088 &glist, &gcount) != 0) 2089 return; 2090 2091 vd = kmem_zalloc(gcount * sizeof (vdev_t *), KM_SLEEP); 2092 2093 /* attempt to online all the vdevs & validate */ 2094 attempt_reopen = B_TRUE; 2095 for (i = 0; i < gcount; i++) { 2096 if (glist[i] == 0) /* vdev is hole */ 2097 continue; 2098 2099 vd[i] = spa_lookup_by_guid(spa, glist[i], B_FALSE); 2100 if (vd[i] == NULL) { 2101 /* 2102 * Don't bother attempting to reopen the disks; 2103 * just do the split. 2104 */ 2105 attempt_reopen = B_FALSE; 2106 } else { 2107 /* attempt to re-online it */ 2108 vd[i]->vdev_offline = B_FALSE; 2109 } 2110 } 2111 2112 if (attempt_reopen) { 2113 vdev_reopen(spa->spa_root_vdev); 2114 2115 /* check each device to see what state it's in */ 2116 for (extracted = 0, i = 0; i < gcount; i++) { 2117 if (vd[i] != NULL && 2118 vd[i]->vdev_stat.vs_aux != VDEV_AUX_SPLIT_POOL) 2119 break; 2120 ++extracted; 2121 } 2122 } 2123 2124 /* 2125 * If every disk has been moved to the new pool, or if we never 2126 * even attempted to look at them, then we split them off for 2127 * good. 2128 */ 2129 if (!attempt_reopen || gcount == extracted) { 2130 for (i = 0; i < gcount; i++) 2131 if (vd[i] != NULL) 2132 vdev_split(vd[i]); 2133 vdev_reopen(spa->spa_root_vdev); 2134 } 2135 2136 kmem_free(vd, gcount * sizeof (vdev_t *)); 2137} 2138 2139static int 2140spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type, 2141 boolean_t mosconfig) 2142{ 2143 nvlist_t *config = spa->spa_config; 2144 char *ereport = FM_EREPORT_ZFS_POOL; 2145 char *comment; 2146 int error; 2147 uint64_t pool_guid; 2148 nvlist_t *nvl; 2149 2150 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, &pool_guid)) 2151 return (SET_ERROR(EINVAL)); 2152 2153 ASSERT(spa->spa_comment == NULL); 2154 if (nvlist_lookup_string(config, ZPOOL_CONFIG_COMMENT, &comment) == 0) 2155 spa->spa_comment = spa_strdup(comment); 2156 2157 /* 2158 * Versioning wasn't explicitly added to the label until later, so if 2159 * it's not present treat it as the initial version. 2160 */ 2161 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 2162 &spa->spa_ubsync.ub_version) != 0) 2163 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 2164 2165 (void) nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, 2166 &spa->spa_config_txg); 2167 2168 if ((state == SPA_LOAD_IMPORT || state == SPA_LOAD_TRYIMPORT) && 2169 spa_guid_exists(pool_guid, 0)) { 2170 error = SET_ERROR(EEXIST); 2171 } else { 2172 spa->spa_config_guid = pool_guid; 2173 2174 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_SPLIT, 2175 &nvl) == 0) { 2176 VERIFY(nvlist_dup(nvl, &spa->spa_config_splitting, 2177 KM_SLEEP) == 0); 2178 } 2179 2180 nvlist_free(spa->spa_load_info); 2181 spa->spa_load_info = fnvlist_alloc(); 2182 2183 gethrestime(&spa->spa_loaded_ts); 2184 error = spa_load_impl(spa, pool_guid, config, state, type, 2185 mosconfig, &ereport); 2186 } 2187 2188 /* 2189 * Don't count references from objsets that are already closed 2190 * and are making their way through the eviction process. 2191 */ 2192 spa_evicting_os_wait(spa); 2193 spa->spa_minref = refcount_count(&spa->spa_refcount); 2194 if (error) { 2195 if (error != EEXIST) { 2196 spa->spa_loaded_ts.tv_sec = 0; 2197 spa->spa_loaded_ts.tv_nsec = 0; 2198 } 2199 if (error != EBADF) { 2200 zfs_ereport_post(ereport, spa, NULL, NULL, 0, 0); 2201 } 2202 } 2203 spa->spa_load_state = error ? SPA_LOAD_ERROR : SPA_LOAD_NONE; 2204 spa->spa_ena = 0; 2205 2206 return (error); 2207} 2208 2209/* 2210 * Load an existing storage pool, using the pool's builtin spa_config as a 2211 * source of configuration information. 2212 */ 2213static int 2214spa_load_impl(spa_t *spa, uint64_t pool_guid, nvlist_t *config, 2215 spa_load_state_t state, spa_import_type_t type, boolean_t mosconfig, 2216 char **ereport) 2217{ 2218 int error = 0; 2219 nvlist_t *nvroot = NULL; 2220 nvlist_t *label; 2221 vdev_t *rvd; 2222 uberblock_t *ub = &spa->spa_uberblock; 2223 uint64_t children, config_cache_txg = spa->spa_config_txg; 2224 int orig_mode = spa->spa_mode; 2225 int parse; 2226 uint64_t obj; 2227 boolean_t missing_feat_write = B_FALSE; 2228 2229 /* 2230 * If this is an untrusted config, access the pool in read-only mode. 2231 * This prevents things like resilvering recently removed devices. 2232 */ 2233 if (!mosconfig) 2234 spa->spa_mode = FREAD; 2235 2236 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 2237 2238 spa->spa_load_state = state; 2239 2240 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvroot)) 2241 return (SET_ERROR(EINVAL)); 2242 2243 parse = (type == SPA_IMPORT_EXISTING ? 2244 VDEV_ALLOC_LOAD : VDEV_ALLOC_SPLIT); 2245 2246 /* 2247 * Create "The Godfather" zio to hold all async IOs 2248 */ 2249 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 2250 KM_SLEEP); 2251 for (int i = 0; i < max_ncpus; i++) { 2252 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 2253 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 2254 ZIO_FLAG_GODFATHER); 2255 } 2256 2257 /* 2258 * Parse the configuration into a vdev tree. We explicitly set the 2259 * value that will be returned by spa_version() since parsing the 2260 * configuration requires knowing the version number. 2261 */ 2262 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2263 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, parse); 2264 spa_config_exit(spa, SCL_ALL, FTAG); 2265 2266 if (error != 0) 2267 return (error); 2268 2269 ASSERT(spa->spa_root_vdev == rvd); 2270 ASSERT3U(spa->spa_min_ashift, >=, SPA_MINBLOCKSHIFT); 2271 ASSERT3U(spa->spa_max_ashift, <=, SPA_MAXBLOCKSHIFT); 2272 2273 if (type != SPA_IMPORT_ASSEMBLE) { 2274 ASSERT(spa_guid(spa) == pool_guid); 2275 } 2276 2277 /* 2278 * Try to open all vdevs, loading each label in the process. 2279 */ 2280 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2281 error = vdev_open(rvd); 2282 spa_config_exit(spa, SCL_ALL, FTAG); 2283 if (error != 0) 2284 return (error); 2285 2286 /* 2287 * We need to validate the vdev labels against the configuration that 2288 * we have in hand, which is dependent on the setting of mosconfig. If 2289 * mosconfig is true then we're validating the vdev labels based on 2290 * that config. Otherwise, we're validating against the cached config 2291 * (zpool.cache) that was read when we loaded the zfs module, and then 2292 * later we will recursively call spa_load() and validate against 2293 * the vdev config. 2294 * 2295 * If we're assembling a new pool that's been split off from an 2296 * existing pool, the labels haven't yet been updated so we skip 2297 * validation for now. 2298 */ 2299 if (type != SPA_IMPORT_ASSEMBLE) { 2300 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2301 error = vdev_validate(rvd, mosconfig); 2302 spa_config_exit(spa, SCL_ALL, FTAG); 2303 2304 if (error != 0) 2305 return (error); 2306 2307 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2308 return (SET_ERROR(ENXIO)); 2309 } 2310 2311 /* 2312 * Find the best uberblock. 2313 */ 2314 vdev_uberblock_load(rvd, ub, &label); 2315 2316 /* 2317 * If we weren't able to find a single valid uberblock, return failure. 2318 */ 2319 if (ub->ub_txg == 0) { 2320 nvlist_free(label); 2321 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, ENXIO)); 2322 } 2323 2324 /* 2325 * If the pool has an unsupported version we can't open it. 2326 */ 2327 if (!SPA_VERSION_IS_SUPPORTED(ub->ub_version)) { 2328 nvlist_free(label); 2329 return (spa_vdev_err(rvd, VDEV_AUX_VERSION_NEWER, ENOTSUP)); 2330 } 2331 2332 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2333 nvlist_t *features; 2334 2335 /* 2336 * If we weren't able to find what's necessary for reading the 2337 * MOS in the label, return failure. 2338 */ 2339 if (label == NULL || nvlist_lookup_nvlist(label, 2340 ZPOOL_CONFIG_FEATURES_FOR_READ, &features) != 0) { 2341 nvlist_free(label); 2342 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2343 ENXIO)); 2344 } 2345 2346 /* 2347 * Update our in-core representation with the definitive values 2348 * from the label. 2349 */ 2350 nvlist_free(spa->spa_label_features); 2351 VERIFY(nvlist_dup(features, &spa->spa_label_features, 0) == 0); 2352 } 2353 2354 nvlist_free(label); 2355 2356 /* 2357 * Look through entries in the label nvlist's features_for_read. If 2358 * there is a feature listed there which we don't understand then we 2359 * cannot open a pool. 2360 */ 2361 if (ub->ub_version >= SPA_VERSION_FEATURES) { 2362 nvlist_t *unsup_feat; 2363 2364 VERIFY(nvlist_alloc(&unsup_feat, NV_UNIQUE_NAME, KM_SLEEP) == 2365 0); 2366 2367 for (nvpair_t *nvp = nvlist_next_nvpair(spa->spa_label_features, 2368 NULL); nvp != NULL; 2369 nvp = nvlist_next_nvpair(spa->spa_label_features, nvp)) { 2370 if (!zfeature_is_supported(nvpair_name(nvp))) { 2371 VERIFY(nvlist_add_string(unsup_feat, 2372 nvpair_name(nvp), "") == 0); 2373 } 2374 } 2375 2376 if (!nvlist_empty(unsup_feat)) { 2377 VERIFY(nvlist_add_nvlist(spa->spa_load_info, 2378 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat) == 0); 2379 nvlist_free(unsup_feat); 2380 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2381 ENOTSUP)); 2382 } 2383 2384 nvlist_free(unsup_feat); 2385 } 2386 2387 /* 2388 * If the vdev guid sum doesn't match the uberblock, we have an 2389 * incomplete configuration. We first check to see if the pool 2390 * is aware of the complete config (i.e ZPOOL_CONFIG_VDEV_CHILDREN). 2391 * If it is, defer the vdev_guid_sum check till later so we 2392 * can handle missing vdevs. 2393 */ 2394 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 2395 &children) != 0 && mosconfig && type != SPA_IMPORT_ASSEMBLE && 2396 rvd->vdev_guid_sum != ub->ub_guid_sum) 2397 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, ENXIO)); 2398 2399 if (type != SPA_IMPORT_ASSEMBLE && spa->spa_config_splitting) { 2400 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2401 spa_try_repair(spa, config); 2402 spa_config_exit(spa, SCL_ALL, FTAG); 2403 nvlist_free(spa->spa_config_splitting); 2404 spa->spa_config_splitting = NULL; 2405 } 2406 2407 /* 2408 * Initialize internal SPA structures. 2409 */ 2410 spa->spa_state = POOL_STATE_ACTIVE; 2411 spa->spa_ubsync = spa->spa_uberblock; 2412 spa->spa_verify_min_txg = spa->spa_extreme_rewind ? 2413 TXG_INITIAL - 1 : spa_last_synced_txg(spa) - TXG_DEFER_SIZE - 1; 2414 spa->spa_first_txg = spa->spa_last_ubsync_txg ? 2415 spa->spa_last_ubsync_txg : spa_last_synced_txg(spa) + 1; 2416 spa->spa_claim_max_txg = spa->spa_first_txg; 2417 spa->spa_prev_software_version = ub->ub_software_version; 2418 2419 error = dsl_pool_init(spa, spa->spa_first_txg, &spa->spa_dsl_pool); 2420 if (error) 2421 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2422 spa->spa_meta_objset = spa->spa_dsl_pool->dp_meta_objset; 2423 2424 if (spa_dir_prop(spa, DMU_POOL_CONFIG, &spa->spa_config_object) != 0) 2425 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2426 2427 if (spa_version(spa) >= SPA_VERSION_FEATURES) { 2428 boolean_t missing_feat_read = B_FALSE; 2429 nvlist_t *unsup_feat, *enabled_feat; 2430 2431 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_READ, 2432 &spa->spa_feat_for_read_obj) != 0) { 2433 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2434 } 2435 2436 if (spa_dir_prop(spa, DMU_POOL_FEATURES_FOR_WRITE, 2437 &spa->spa_feat_for_write_obj) != 0) { 2438 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2439 } 2440 2441 if (spa_dir_prop(spa, DMU_POOL_FEATURE_DESCRIPTIONS, 2442 &spa->spa_feat_desc_obj) != 0) { 2443 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2444 } 2445 2446 enabled_feat = fnvlist_alloc(); 2447 unsup_feat = fnvlist_alloc(); 2448 2449 if (!spa_features_check(spa, B_FALSE, 2450 unsup_feat, enabled_feat)) 2451 missing_feat_read = B_TRUE; 2452 2453 if (spa_writeable(spa) || state == SPA_LOAD_TRYIMPORT) { 2454 if (!spa_features_check(spa, B_TRUE, 2455 unsup_feat, enabled_feat)) { 2456 missing_feat_write = B_TRUE; 2457 } 2458 } 2459 2460 fnvlist_add_nvlist(spa->spa_load_info, 2461 ZPOOL_CONFIG_ENABLED_FEAT, enabled_feat); 2462 2463 if (!nvlist_empty(unsup_feat)) { 2464 fnvlist_add_nvlist(spa->spa_load_info, 2465 ZPOOL_CONFIG_UNSUP_FEAT, unsup_feat); 2466 } 2467 2468 fnvlist_free(enabled_feat); 2469 fnvlist_free(unsup_feat); 2470 2471 if (!missing_feat_read) { 2472 fnvlist_add_boolean(spa->spa_load_info, 2473 ZPOOL_CONFIG_CAN_RDONLY); 2474 } 2475 2476 /* 2477 * If the state is SPA_LOAD_TRYIMPORT, our objective is 2478 * twofold: to determine whether the pool is available for 2479 * import in read-write mode and (if it is not) whether the 2480 * pool is available for import in read-only mode. If the pool 2481 * is available for import in read-write mode, it is displayed 2482 * as available in userland; if it is not available for import 2483 * in read-only mode, it is displayed as unavailable in 2484 * userland. If the pool is available for import in read-only 2485 * mode but not read-write mode, it is displayed as unavailable 2486 * in userland with a special note that the pool is actually 2487 * available for open in read-only mode. 2488 * 2489 * As a result, if the state is SPA_LOAD_TRYIMPORT and we are 2490 * missing a feature for write, we must first determine whether 2491 * the pool can be opened read-only before returning to 2492 * userland in order to know whether to display the 2493 * abovementioned note. 2494 */ 2495 if (missing_feat_read || (missing_feat_write && 2496 spa_writeable(spa))) { 2497 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, 2498 ENOTSUP)); 2499 } 2500 2501 /* 2502 * Load refcounts for ZFS features from disk into an in-memory 2503 * cache during SPA initialization. 2504 */ 2505 for (spa_feature_t i = 0; i < SPA_FEATURES; i++) { 2506 uint64_t refcount; 2507 2508 error = feature_get_refcount_from_disk(spa, 2509 &spa_feature_table[i], &refcount); 2510 if (error == 0) { 2511 spa->spa_feat_refcount_cache[i] = refcount; 2512 } else if (error == ENOTSUP) { 2513 spa->spa_feat_refcount_cache[i] = 2514 SPA_FEATURE_DISABLED; 2515 } else { 2516 return (spa_vdev_err(rvd, 2517 VDEV_AUX_CORRUPT_DATA, EIO)); 2518 } 2519 } 2520 } 2521 2522 if (spa_feature_is_active(spa, SPA_FEATURE_ENABLED_TXG)) { 2523 if (spa_dir_prop(spa, DMU_POOL_FEATURE_ENABLED_TXG, 2524 &spa->spa_feat_enabled_txg_obj) != 0) 2525 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2526 } 2527 2528 spa->spa_is_initializing = B_TRUE; 2529 error = dsl_pool_open(spa->spa_dsl_pool); 2530 spa->spa_is_initializing = B_FALSE; 2531 if (error != 0) 2532 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2533 2534 if (!mosconfig) { 2535 uint64_t hostid; 2536 nvlist_t *policy = NULL, *nvconfig; 2537 2538 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2539 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2540 2541 if (!spa_is_root(spa) && nvlist_lookup_uint64(nvconfig, 2542 ZPOOL_CONFIG_HOSTID, &hostid) == 0) { 2543 char *hostname; 2544 unsigned long myhostid = 0; 2545 2546 VERIFY(nvlist_lookup_string(nvconfig, 2547 ZPOOL_CONFIG_HOSTNAME, &hostname) == 0); 2548 2549#ifdef _KERNEL 2550 myhostid = zone_get_hostid(NULL); 2551#else /* _KERNEL */ 2552 /* 2553 * We're emulating the system's hostid in userland, so 2554 * we can't use zone_get_hostid(). 2555 */ 2556 (void) ddi_strtoul(hw_serial, NULL, 10, &myhostid); 2557#endif /* _KERNEL */ 2558 if (check_hostid && hostid != 0 && myhostid != 0 && 2559 hostid != myhostid) { 2560 nvlist_free(nvconfig); 2561 cmn_err(CE_WARN, "pool '%s' could not be " 2562 "loaded as it was last accessed by " 2563 "another system (host: %s hostid: 0x%lx). " 2564 "See: http://illumos.org/msg/ZFS-8000-EY", 2565 spa_name(spa), hostname, 2566 (unsigned long)hostid); 2567 return (SET_ERROR(EBADF)); 2568 } 2569 } 2570 if (nvlist_lookup_nvlist(spa->spa_config, 2571 ZPOOL_REWIND_POLICY, &policy) == 0) 2572 VERIFY(nvlist_add_nvlist(nvconfig, 2573 ZPOOL_REWIND_POLICY, policy) == 0); 2574 2575 spa_config_set(spa, nvconfig); 2576 spa_unload(spa); 2577 spa_deactivate(spa); 2578 spa_activate(spa, orig_mode); 2579 2580 return (spa_load(spa, state, SPA_IMPORT_EXISTING, B_TRUE)); 2581 } 2582 2583 /* Grab the secret checksum salt from the MOS. */ 2584 error = zap_lookup(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 2585 DMU_POOL_CHECKSUM_SALT, 1, 2586 sizeof (spa->spa_cksum_salt.zcs_bytes), 2587 spa->spa_cksum_salt.zcs_bytes); 2588 if (error == ENOENT) { 2589 /* Generate a new salt for subsequent use */ 2590 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 2591 sizeof (spa->spa_cksum_salt.zcs_bytes)); 2592 } else if (error != 0) { 2593 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2594 } 2595 2596 if (spa_dir_prop(spa, DMU_POOL_SYNC_BPOBJ, &obj) != 0) 2597 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2598 error = bpobj_open(&spa->spa_deferred_bpobj, spa->spa_meta_objset, obj); 2599 if (error != 0) 2600 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2601 2602 /* 2603 * Load the bit that tells us to use the new accounting function 2604 * (raid-z deflation). If we have an older pool, this will not 2605 * be present. 2606 */ 2607 error = spa_dir_prop(spa, DMU_POOL_DEFLATE, &spa->spa_deflate); 2608 if (error != 0 && error != ENOENT) 2609 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2610 2611 error = spa_dir_prop(spa, DMU_POOL_CREATION_VERSION, 2612 &spa->spa_creation_version); 2613 if (error != 0 && error != ENOENT) 2614 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2615 2616 /* 2617 * Load the persistent error log. If we have an older pool, this will 2618 * not be present. 2619 */ 2620 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_LAST, &spa->spa_errlog_last); 2621 if (error != 0 && error != ENOENT) 2622 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2623 2624 error = spa_dir_prop(spa, DMU_POOL_ERRLOG_SCRUB, 2625 &spa->spa_errlog_scrub); 2626 if (error != 0 && error != ENOENT) 2627 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2628 2629 /* 2630 * Load the history object. If we have an older pool, this 2631 * will not be present. 2632 */ 2633 error = spa_dir_prop(spa, DMU_POOL_HISTORY, &spa->spa_history); 2634 if (error != 0 && error != ENOENT) 2635 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2636 2637 /* 2638 * If we're assembling the pool from the split-off vdevs of 2639 * an existing pool, we don't want to attach the spares & cache 2640 * devices. 2641 */ 2642 2643 /* 2644 * Load any hot spares for this pool. 2645 */ 2646 error = spa_dir_prop(spa, DMU_POOL_SPARES, &spa->spa_spares.sav_object); 2647 if (error != 0 && error != ENOENT) 2648 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2649 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2650 ASSERT(spa_version(spa) >= SPA_VERSION_SPARES); 2651 if (load_nvlist(spa, spa->spa_spares.sav_object, 2652 &spa->spa_spares.sav_config) != 0) 2653 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2654 2655 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2656 spa_load_spares(spa); 2657 spa_config_exit(spa, SCL_ALL, FTAG); 2658 } else if (error == 0) { 2659 spa->spa_spares.sav_sync = B_TRUE; 2660 } 2661 2662 /* 2663 * Load any level 2 ARC devices for this pool. 2664 */ 2665 error = spa_dir_prop(spa, DMU_POOL_L2CACHE, 2666 &spa->spa_l2cache.sav_object); 2667 if (error != 0 && error != ENOENT) 2668 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2669 if (error == 0 && type != SPA_IMPORT_ASSEMBLE) { 2670 ASSERT(spa_version(spa) >= SPA_VERSION_L2CACHE); 2671 if (load_nvlist(spa, spa->spa_l2cache.sav_object, 2672 &spa->spa_l2cache.sav_config) != 0) 2673 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2674 2675 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2676 spa_load_l2cache(spa); 2677 spa_config_exit(spa, SCL_ALL, FTAG); 2678 } else if (error == 0) { 2679 spa->spa_l2cache.sav_sync = B_TRUE; 2680 } 2681 2682 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 2683 2684 error = spa_dir_prop(spa, DMU_POOL_PROPS, &spa->spa_pool_props_object); 2685 if (error && error != ENOENT) 2686 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2687 2688 if (error == 0) { 2689 uint64_t autoreplace; 2690 2691 spa_prop_find(spa, ZPOOL_PROP_BOOTFS, &spa->spa_bootfs); 2692 spa_prop_find(spa, ZPOOL_PROP_AUTOREPLACE, &autoreplace); 2693 spa_prop_find(spa, ZPOOL_PROP_DELEGATION, &spa->spa_delegation); 2694 spa_prop_find(spa, ZPOOL_PROP_FAILUREMODE, &spa->spa_failmode); 2695 spa_prop_find(spa, ZPOOL_PROP_AUTOEXPAND, &spa->spa_autoexpand); 2696 spa_prop_find(spa, ZPOOL_PROP_DEDUPDITTO, 2697 &spa->spa_dedup_ditto); 2698 2699 spa->spa_autoreplace = (autoreplace != 0); 2700 } 2701 2702 /* 2703 * If the 'autoreplace' property is set, then post a resource notifying 2704 * the ZFS DE that it should not issue any faults for unopenable 2705 * devices. We also iterate over the vdevs, and post a sysevent for any 2706 * unopenable vdevs so that the normal autoreplace handler can take 2707 * over. 2708 */ 2709 if (spa->spa_autoreplace && state != SPA_LOAD_TRYIMPORT) { 2710 spa_check_removed(spa->spa_root_vdev); 2711 /* 2712 * For the import case, this is done in spa_import(), because 2713 * at this point we're using the spare definitions from 2714 * the MOS config, not necessarily from the userland config. 2715 */ 2716 if (state != SPA_LOAD_IMPORT) { 2717 spa_aux_check_removed(&spa->spa_spares); 2718 spa_aux_check_removed(&spa->spa_l2cache); 2719 } 2720 } 2721 2722 /* 2723 * Load the vdev state for all toplevel vdevs. 2724 */ 2725 vdev_load(rvd); 2726 2727 /* 2728 * Propagate the leaf DTLs we just loaded all the way up the tree. 2729 */ 2730 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 2731 vdev_dtl_reassess(rvd, 0, 0, B_FALSE); 2732 spa_config_exit(spa, SCL_ALL, FTAG); 2733 2734 /* 2735 * Load the DDTs (dedup tables). 2736 */ 2737 error = ddt_load(spa); 2738 if (error != 0) 2739 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2740 2741 spa_update_dspace(spa); 2742 2743 /* 2744 * Validate the config, using the MOS config to fill in any 2745 * information which might be missing. If we fail to validate 2746 * the config then declare the pool unfit for use. If we're 2747 * assembling a pool from a split, the log is not transferred 2748 * over. 2749 */ 2750 if (type != SPA_IMPORT_ASSEMBLE) { 2751 nvlist_t *nvconfig; 2752 2753 if (load_nvlist(spa, spa->spa_config_object, &nvconfig) != 0) 2754 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, EIO)); 2755 2756 if (!spa_config_valid(spa, nvconfig)) { 2757 nvlist_free(nvconfig); 2758 return (spa_vdev_err(rvd, VDEV_AUX_BAD_GUID_SUM, 2759 ENXIO)); 2760 } 2761 nvlist_free(nvconfig); 2762 2763 /* 2764 * Now that we've validated the config, check the state of the 2765 * root vdev. If it can't be opened, it indicates one or 2766 * more toplevel vdevs are faulted. 2767 */ 2768 if (rvd->vdev_state <= VDEV_STATE_CANT_OPEN) 2769 return (SET_ERROR(ENXIO)); 2770 2771 if (spa_writeable(spa) && spa_check_logs(spa)) { 2772 *ereport = FM_EREPORT_ZFS_LOG_REPLAY; 2773 return (spa_vdev_err(rvd, VDEV_AUX_BAD_LOG, ENXIO)); 2774 } 2775 } 2776 2777 if (missing_feat_write) { 2778 ASSERT(state == SPA_LOAD_TRYIMPORT); 2779 2780 /* 2781 * At this point, we know that we can open the pool in 2782 * read-only mode but not read-write mode. We now have enough 2783 * information and can return to userland. 2784 */ 2785 return (spa_vdev_err(rvd, VDEV_AUX_UNSUP_FEAT, ENOTSUP)); 2786 } 2787 2788 /* 2789 * We've successfully opened the pool, verify that we're ready 2790 * to start pushing transactions. 2791 */ 2792 if (state != SPA_LOAD_TRYIMPORT) { 2793 if (error = spa_load_verify(spa)) 2794 return (spa_vdev_err(rvd, VDEV_AUX_CORRUPT_DATA, 2795 error)); 2796 } 2797 2798 if (spa_writeable(spa) && (state == SPA_LOAD_RECOVER || 2799 spa->spa_load_max_txg == UINT64_MAX)) { 2800 dmu_tx_t *tx; 2801 int need_update = B_FALSE; 2802 dsl_pool_t *dp = spa_get_dsl(spa); 2803 2804 ASSERT(state != SPA_LOAD_TRYIMPORT); 2805 2806 /* 2807 * Claim log blocks that haven't been committed yet. 2808 * This must all happen in a single txg. 2809 * Note: spa_claim_max_txg is updated by spa_claim_notify(), 2810 * invoked from zil_claim_log_block()'s i/o done callback. 2811 * Price of rollback is that we abandon the log. 2812 */ 2813 spa->spa_claiming = B_TRUE; 2814 2815 tx = dmu_tx_create_assigned(dp, spa_first_txg(spa)); 2816 (void) dmu_objset_find_dp(dp, dp->dp_root_dir_obj, 2817 zil_claim, tx, DS_FIND_CHILDREN); 2818 dmu_tx_commit(tx); 2819 2820 spa->spa_claiming = B_FALSE; 2821 2822 spa_set_log_state(spa, SPA_LOG_GOOD); 2823 spa->spa_sync_on = B_TRUE; 2824 txg_sync_start(spa->spa_dsl_pool); 2825 2826 /* 2827 * Wait for all claims to sync. We sync up to the highest 2828 * claimed log block birth time so that claimed log blocks 2829 * don't appear to be from the future. spa_claim_max_txg 2830 * will have been set for us by either zil_check_log_chain() 2831 * (invoked from spa_check_logs()) or zil_claim() above. 2832 */ 2833 txg_wait_synced(spa->spa_dsl_pool, spa->spa_claim_max_txg); 2834 2835 /* 2836 * If the config cache is stale, or we have uninitialized 2837 * metaslabs (see spa_vdev_add()), then update the config. 2838 * 2839 * If this is a verbatim import, trust the current 2840 * in-core spa_config and update the disk labels. 2841 */ 2842 if (config_cache_txg != spa->spa_config_txg || 2843 state == SPA_LOAD_IMPORT || 2844 state == SPA_LOAD_RECOVER || 2845 (spa->spa_import_flags & ZFS_IMPORT_VERBATIM)) 2846 need_update = B_TRUE; 2847 2848 for (int c = 0; c < rvd->vdev_children; c++) 2849 if (rvd->vdev_child[c]->vdev_ms_array == 0) 2850 need_update = B_TRUE; 2851 2852 /* 2853 * Update the config cache asychronously in case we're the 2854 * root pool, in which case the config cache isn't writable yet. 2855 */ 2856 if (need_update) 2857 spa_async_request(spa, SPA_ASYNC_CONFIG_UPDATE); 2858 2859 /* 2860 * Check all DTLs to see if anything needs resilvering. 2861 */ 2862 if (!dsl_scan_resilvering(spa->spa_dsl_pool) && 2863 vdev_resilver_needed(rvd, NULL, NULL)) 2864 spa_async_request(spa, SPA_ASYNC_RESILVER); 2865 2866 /* 2867 * Log the fact that we booted up (so that we can detect if 2868 * we rebooted in the middle of an operation). 2869 */ 2870 spa_history_log_version(spa, "open"); 2871 2872 /* 2873 * Delete any inconsistent datasets. 2874 */ 2875 (void) dmu_objset_find(spa_name(spa), 2876 dsl_destroy_inconsistent, NULL, DS_FIND_CHILDREN); 2877 2878 /* 2879 * Clean up any stale temporary dataset userrefs. 2880 */ 2881 dsl_pool_clean_tmp_userrefs(spa->spa_dsl_pool); 2882 } 2883 2884 return (0); 2885} 2886 2887static int 2888spa_load_retry(spa_t *spa, spa_load_state_t state, int mosconfig) 2889{ 2890 int mode = spa->spa_mode; 2891 2892 spa_unload(spa); 2893 spa_deactivate(spa); 2894 2895 spa->spa_load_max_txg = spa->spa_uberblock.ub_txg - 1; 2896 2897 spa_activate(spa, mode); 2898 spa_async_suspend(spa); 2899 2900 return (spa_load(spa, state, SPA_IMPORT_EXISTING, mosconfig)); 2901} 2902 2903/* 2904 * If spa_load() fails this function will try loading prior txg's. If 2905 * 'state' is SPA_LOAD_RECOVER and one of these loads succeeds the pool 2906 * will be rewound to that txg. If 'state' is not SPA_LOAD_RECOVER this 2907 * function will not rewind the pool and will return the same error as 2908 * spa_load(). 2909 */ 2910static int 2911spa_load_best(spa_t *spa, spa_load_state_t state, int mosconfig, 2912 uint64_t max_request, int rewind_flags) 2913{ 2914 nvlist_t *loadinfo = NULL; 2915 nvlist_t *config = NULL; 2916 int load_error, rewind_error; 2917 uint64_t safe_rewind_txg; 2918 uint64_t min_txg; 2919 2920 if (spa->spa_load_txg && state == SPA_LOAD_RECOVER) { 2921 spa->spa_load_max_txg = spa->spa_load_txg; 2922 spa_set_log_state(spa, SPA_LOG_CLEAR); 2923 } else { 2924 spa->spa_load_max_txg = max_request; 2925 if (max_request != UINT64_MAX) 2926 spa->spa_extreme_rewind = B_TRUE; 2927 } 2928 2929 load_error = rewind_error = spa_load(spa, state, SPA_IMPORT_EXISTING, 2930 mosconfig); 2931 if (load_error == 0) 2932 return (0); 2933 2934 if (spa->spa_root_vdev != NULL) 2935 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 2936 2937 spa->spa_last_ubsync_txg = spa->spa_uberblock.ub_txg; 2938 spa->spa_last_ubsync_txg_ts = spa->spa_uberblock.ub_timestamp; 2939 2940 if (rewind_flags & ZPOOL_NEVER_REWIND) { 2941 nvlist_free(config); 2942 return (load_error); 2943 } 2944 2945 if (state == SPA_LOAD_RECOVER) { 2946 /* Price of rolling back is discarding txgs, including log */ 2947 spa_set_log_state(spa, SPA_LOG_CLEAR); 2948 } else { 2949 /* 2950 * If we aren't rolling back save the load info from our first 2951 * import attempt so that we can restore it after attempting 2952 * to rewind. 2953 */ 2954 loadinfo = spa->spa_load_info; 2955 spa->spa_load_info = fnvlist_alloc(); 2956 } 2957 2958 spa->spa_load_max_txg = spa->spa_last_ubsync_txg; 2959 safe_rewind_txg = spa->spa_last_ubsync_txg - TXG_DEFER_SIZE; 2960 min_txg = (rewind_flags & ZPOOL_EXTREME_REWIND) ? 2961 TXG_INITIAL : safe_rewind_txg; 2962 2963 /* 2964 * Continue as long as we're finding errors, we're still within 2965 * the acceptable rewind range, and we're still finding uberblocks 2966 */ 2967 while (rewind_error && spa->spa_uberblock.ub_txg >= min_txg && 2968 spa->spa_uberblock.ub_txg <= spa->spa_load_max_txg) { 2969 if (spa->spa_load_max_txg < safe_rewind_txg) 2970 spa->spa_extreme_rewind = B_TRUE; 2971 rewind_error = spa_load_retry(spa, state, mosconfig); 2972 } 2973 2974 spa->spa_extreme_rewind = B_FALSE; 2975 spa->spa_load_max_txg = UINT64_MAX; 2976 2977 if (config && (rewind_error || state != SPA_LOAD_RECOVER)) 2978 spa_config_set(spa, config); 2979 2980 if (state == SPA_LOAD_RECOVER) { 2981 ASSERT3P(loadinfo, ==, NULL); 2982 return (rewind_error); 2983 } else { 2984 /* Store the rewind info as part of the initial load info */ 2985 fnvlist_add_nvlist(loadinfo, ZPOOL_CONFIG_REWIND_INFO, 2986 spa->spa_load_info); 2987 2988 /* Restore the initial load info */ 2989 fnvlist_free(spa->spa_load_info); 2990 spa->spa_load_info = loadinfo; 2991 2992 return (load_error); 2993 } 2994} 2995 2996/* 2997 * Pool Open/Import 2998 * 2999 * The import case is identical to an open except that the configuration is sent 3000 * down from userland, instead of grabbed from the configuration cache. For the 3001 * case of an open, the pool configuration will exist in the 3002 * POOL_STATE_UNINITIALIZED state. 3003 * 3004 * The stats information (gen/count/ustats) is used to gather vdev statistics at 3005 * the same time open the pool, without having to keep around the spa_t in some 3006 * ambiguous state. 3007 */ 3008static int 3009spa_open_common(const char *pool, spa_t **spapp, void *tag, nvlist_t *nvpolicy, 3010 nvlist_t **config) 3011{ 3012 spa_t *spa; 3013 spa_load_state_t state = SPA_LOAD_OPEN; 3014 int error; 3015 int locked = B_FALSE; 3016 int firstopen = B_FALSE; 3017 3018 *spapp = NULL; 3019 3020 /* 3021 * As disgusting as this is, we need to support recursive calls to this 3022 * function because dsl_dir_open() is called during spa_load(), and ends 3023 * up calling spa_open() again. The real fix is to figure out how to 3024 * avoid dsl_dir_open() calling this in the first place. 3025 */ 3026 if (mutex_owner(&spa_namespace_lock) != curthread) { 3027 mutex_enter(&spa_namespace_lock); 3028 locked = B_TRUE; 3029 } 3030 3031 if ((spa = spa_lookup(pool)) == NULL) { 3032 if (locked) 3033 mutex_exit(&spa_namespace_lock); 3034 return (SET_ERROR(ENOENT)); 3035 } 3036 3037 if (spa->spa_state == POOL_STATE_UNINITIALIZED) { 3038 zpool_rewind_policy_t policy; 3039 3040 firstopen = B_TRUE; 3041 3042 zpool_get_rewind_policy(nvpolicy ? nvpolicy : spa->spa_config, 3043 &policy); 3044 if (policy.zrp_request & ZPOOL_DO_REWIND) 3045 state = SPA_LOAD_RECOVER; 3046 3047 spa_activate(spa, spa_mode_global); 3048 3049 if (state != SPA_LOAD_RECOVER) 3050 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 3051 3052 error = spa_load_best(spa, state, B_FALSE, policy.zrp_txg, 3053 policy.zrp_request); 3054 3055 if (error == EBADF) { 3056 /* 3057 * If vdev_validate() returns failure (indicated by 3058 * EBADF), it indicates that one of the vdevs indicates 3059 * that the pool has been exported or destroyed. If 3060 * this is the case, the config cache is out of sync and 3061 * we should remove the pool from the namespace. 3062 */ 3063 spa_unload(spa); 3064 spa_deactivate(spa); 3065 spa_config_sync(spa, B_TRUE, B_TRUE); 3066 spa_remove(spa); 3067 if (locked) 3068 mutex_exit(&spa_namespace_lock); 3069 return (SET_ERROR(ENOENT)); 3070 } 3071 3072 if (error) { 3073 /* 3074 * We can't open the pool, but we still have useful 3075 * information: the state of each vdev after the 3076 * attempted vdev_open(). Return this to the user. 3077 */ 3078 if (config != NULL && spa->spa_config) { 3079 VERIFY(nvlist_dup(spa->spa_config, config, 3080 KM_SLEEP) == 0); 3081 VERIFY(nvlist_add_nvlist(*config, 3082 ZPOOL_CONFIG_LOAD_INFO, 3083 spa->spa_load_info) == 0); 3084 } 3085 spa_unload(spa); 3086 spa_deactivate(spa); 3087 spa->spa_last_open_failed = error; 3088 if (locked) 3089 mutex_exit(&spa_namespace_lock); 3090 *spapp = NULL; 3091 return (error); 3092 } 3093 } 3094 3095 spa_open_ref(spa, tag); 3096 3097 if (config != NULL) 3098 *config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 3099 3100 /* 3101 * If we've recovered the pool, pass back any information we 3102 * gathered while doing the load. 3103 */ 3104 if (state == SPA_LOAD_RECOVER) { 3105 VERIFY(nvlist_add_nvlist(*config, ZPOOL_CONFIG_LOAD_INFO, 3106 spa->spa_load_info) == 0); 3107 } 3108 3109 if (locked) { 3110 spa->spa_last_open_failed = 0; 3111 spa->spa_last_ubsync_txg = 0; 3112 spa->spa_load_txg = 0; 3113 mutex_exit(&spa_namespace_lock); 3114#ifdef __FreeBSD__ 3115#ifdef _KERNEL 3116 if (firstopen) 3117 zvol_create_minors(spa->spa_name); 3118#endif 3119#endif 3120 } 3121 3122 *spapp = spa; 3123 3124 return (0); 3125} 3126 3127int 3128spa_open_rewind(const char *name, spa_t **spapp, void *tag, nvlist_t *policy, 3129 nvlist_t **config) 3130{ 3131 return (spa_open_common(name, spapp, tag, policy, config)); 3132} 3133 3134int 3135spa_open(const char *name, spa_t **spapp, void *tag) 3136{ 3137 return (spa_open_common(name, spapp, tag, NULL, NULL)); 3138} 3139 3140/* 3141 * Lookup the given spa_t, incrementing the inject count in the process, 3142 * preventing it from being exported or destroyed. 3143 */ 3144spa_t * 3145spa_inject_addref(char *name) 3146{ 3147 spa_t *spa; 3148 3149 mutex_enter(&spa_namespace_lock); 3150 if ((spa = spa_lookup(name)) == NULL) { 3151 mutex_exit(&spa_namespace_lock); 3152 return (NULL); 3153 } 3154 spa->spa_inject_ref++; 3155 mutex_exit(&spa_namespace_lock); 3156 3157 return (spa); 3158} 3159 3160void 3161spa_inject_delref(spa_t *spa) 3162{ 3163 mutex_enter(&spa_namespace_lock); 3164 spa->spa_inject_ref--; 3165 mutex_exit(&spa_namespace_lock); 3166} 3167 3168/* 3169 * Add spares device information to the nvlist. 3170 */ 3171static void 3172spa_add_spares(spa_t *spa, nvlist_t *config) 3173{ 3174 nvlist_t **spares; 3175 uint_t i, nspares; 3176 nvlist_t *nvroot; 3177 uint64_t guid; 3178 vdev_stat_t *vs; 3179 uint_t vsc; 3180 uint64_t pool; 3181 3182 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3183 3184 if (spa->spa_spares.sav_count == 0) 3185 return; 3186 3187 VERIFY(nvlist_lookup_nvlist(config, 3188 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3189 VERIFY(nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 3190 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3191 if (nspares != 0) { 3192 VERIFY(nvlist_add_nvlist_array(nvroot, 3193 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3194 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3195 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0); 3196 3197 /* 3198 * Go through and find any spares which have since been 3199 * repurposed as an active spare. If this is the case, update 3200 * their status appropriately. 3201 */ 3202 for (i = 0; i < nspares; i++) { 3203 VERIFY(nvlist_lookup_uint64(spares[i], 3204 ZPOOL_CONFIG_GUID, &guid) == 0); 3205 if (spa_spare_exists(guid, &pool, NULL) && 3206 pool != 0ULL) { 3207 VERIFY(nvlist_lookup_uint64_array( 3208 spares[i], ZPOOL_CONFIG_VDEV_STATS, 3209 (uint64_t **)&vs, &vsc) == 0); 3210 vs->vs_state = VDEV_STATE_CANT_OPEN; 3211 vs->vs_aux = VDEV_AUX_SPARED; 3212 } 3213 } 3214 } 3215} 3216 3217/* 3218 * Add l2cache device information to the nvlist, including vdev stats. 3219 */ 3220static void 3221spa_add_l2cache(spa_t *spa, nvlist_t *config) 3222{ 3223 nvlist_t **l2cache; 3224 uint_t i, j, nl2cache; 3225 nvlist_t *nvroot; 3226 uint64_t guid; 3227 vdev_t *vd; 3228 vdev_stat_t *vs; 3229 uint_t vsc; 3230 3231 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3232 3233 if (spa->spa_l2cache.sav_count == 0) 3234 return; 3235 3236 VERIFY(nvlist_lookup_nvlist(config, 3237 ZPOOL_CONFIG_VDEV_TREE, &nvroot) == 0); 3238 VERIFY(nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 3239 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3240 if (nl2cache != 0) { 3241 VERIFY(nvlist_add_nvlist_array(nvroot, 3242 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3243 VERIFY(nvlist_lookup_nvlist_array(nvroot, 3244 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0); 3245 3246 /* 3247 * Update level 2 cache device stats. 3248 */ 3249 3250 for (i = 0; i < nl2cache; i++) { 3251 VERIFY(nvlist_lookup_uint64(l2cache[i], 3252 ZPOOL_CONFIG_GUID, &guid) == 0); 3253 3254 vd = NULL; 3255 for (j = 0; j < spa->spa_l2cache.sav_count; j++) { 3256 if (guid == 3257 spa->spa_l2cache.sav_vdevs[j]->vdev_guid) { 3258 vd = spa->spa_l2cache.sav_vdevs[j]; 3259 break; 3260 } 3261 } 3262 ASSERT(vd != NULL); 3263 3264 VERIFY(nvlist_lookup_uint64_array(l2cache[i], 3265 ZPOOL_CONFIG_VDEV_STATS, (uint64_t **)&vs, &vsc) 3266 == 0); 3267 vdev_get_stats(vd, vs); 3268 } 3269 } 3270} 3271 3272static void 3273spa_add_feature_stats(spa_t *spa, nvlist_t *config) 3274{ 3275 nvlist_t *features; 3276 zap_cursor_t zc; 3277 zap_attribute_t za; 3278 3279 ASSERT(spa_config_held(spa, SCL_CONFIG, RW_READER)); 3280 VERIFY(nvlist_alloc(&features, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3281 3282 /* We may be unable to read features if pool is suspended. */ 3283 if (spa_suspended(spa)) 3284 goto out; 3285 3286 if (spa->spa_feat_for_read_obj != 0) { 3287 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3288 spa->spa_feat_for_read_obj); 3289 zap_cursor_retrieve(&zc, &za) == 0; 3290 zap_cursor_advance(&zc)) { 3291 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3292 za.za_num_integers == 1); 3293 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3294 za.za_first_integer)); 3295 } 3296 zap_cursor_fini(&zc); 3297 } 3298 3299 if (spa->spa_feat_for_write_obj != 0) { 3300 for (zap_cursor_init(&zc, spa->spa_meta_objset, 3301 spa->spa_feat_for_write_obj); 3302 zap_cursor_retrieve(&zc, &za) == 0; 3303 zap_cursor_advance(&zc)) { 3304 ASSERT(za.za_integer_length == sizeof (uint64_t) && 3305 za.za_num_integers == 1); 3306 VERIFY3U(0, ==, nvlist_add_uint64(features, za.za_name, 3307 za.za_first_integer)); 3308 } 3309 zap_cursor_fini(&zc); 3310 } 3311 3312out: 3313 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_FEATURE_STATS, 3314 features) == 0); 3315 nvlist_free(features); 3316} 3317 3318int 3319spa_get_stats(const char *name, nvlist_t **config, 3320 char *altroot, size_t buflen) 3321{ 3322 int error; 3323 spa_t *spa; 3324 3325 *config = NULL; 3326 error = spa_open_common(name, &spa, FTAG, NULL, config); 3327 3328 if (spa != NULL) { 3329 /* 3330 * This still leaves a window of inconsistency where the spares 3331 * or l2cache devices could change and the config would be 3332 * self-inconsistent. 3333 */ 3334 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 3335 3336 if (*config != NULL) { 3337 uint64_t loadtimes[2]; 3338 3339 loadtimes[0] = spa->spa_loaded_ts.tv_sec; 3340 loadtimes[1] = spa->spa_loaded_ts.tv_nsec; 3341 VERIFY(nvlist_add_uint64_array(*config, 3342 ZPOOL_CONFIG_LOADED_TIME, loadtimes, 2) == 0); 3343 3344 VERIFY(nvlist_add_uint64(*config, 3345 ZPOOL_CONFIG_ERRCOUNT, 3346 spa_get_errlog_size(spa)) == 0); 3347 3348 if (spa_suspended(spa)) 3349 VERIFY(nvlist_add_uint64(*config, 3350 ZPOOL_CONFIG_SUSPENDED, 3351 spa->spa_failmode) == 0); 3352 3353 spa_add_spares(spa, *config); 3354 spa_add_l2cache(spa, *config); 3355 spa_add_feature_stats(spa, *config); 3356 } 3357 } 3358 3359 /* 3360 * We want to get the alternate root even for faulted pools, so we cheat 3361 * and call spa_lookup() directly. 3362 */ 3363 if (altroot) { 3364 if (spa == NULL) { 3365 mutex_enter(&spa_namespace_lock); 3366 spa = spa_lookup(name); 3367 if (spa) 3368 spa_altroot(spa, altroot, buflen); 3369 else 3370 altroot[0] = '\0'; 3371 spa = NULL; 3372 mutex_exit(&spa_namespace_lock); 3373 } else { 3374 spa_altroot(spa, altroot, buflen); 3375 } 3376 } 3377 3378 if (spa != NULL) { 3379 spa_config_exit(spa, SCL_CONFIG, FTAG); 3380 spa_close(spa, FTAG); 3381 } 3382 3383 return (error); 3384} 3385 3386/* 3387 * Validate that the auxiliary device array is well formed. We must have an 3388 * array of nvlists, each which describes a valid leaf vdev. If this is an 3389 * import (mode is VDEV_ALLOC_SPARE), then we allow corrupted spares to be 3390 * specified, as long as they are well-formed. 3391 */ 3392static int 3393spa_validate_aux_devs(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode, 3394 spa_aux_vdev_t *sav, const char *config, uint64_t version, 3395 vdev_labeltype_t label) 3396{ 3397 nvlist_t **dev; 3398 uint_t i, ndev; 3399 vdev_t *vd; 3400 int error; 3401 3402 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3403 3404 /* 3405 * It's acceptable to have no devs specified. 3406 */ 3407 if (nvlist_lookup_nvlist_array(nvroot, config, &dev, &ndev) != 0) 3408 return (0); 3409 3410 if (ndev == 0) 3411 return (SET_ERROR(EINVAL)); 3412 3413 /* 3414 * Make sure the pool is formatted with a version that supports this 3415 * device type. 3416 */ 3417 if (spa_version(spa) < version) 3418 return (SET_ERROR(ENOTSUP)); 3419 3420 /* 3421 * Set the pending device list so we correctly handle device in-use 3422 * checking. 3423 */ 3424 sav->sav_pending = dev; 3425 sav->sav_npending = ndev; 3426 3427 for (i = 0; i < ndev; i++) { 3428 if ((error = spa_config_parse(spa, &vd, dev[i], NULL, 0, 3429 mode)) != 0) 3430 goto out; 3431 3432 if (!vd->vdev_ops->vdev_op_leaf) { 3433 vdev_free(vd); 3434 error = SET_ERROR(EINVAL); 3435 goto out; 3436 } 3437 3438 /* 3439 * The L2ARC currently only supports disk devices in 3440 * kernel context. For user-level testing, we allow it. 3441 */ 3442#ifdef _KERNEL 3443 if ((strcmp(config, ZPOOL_CONFIG_L2CACHE) == 0) && 3444 strcmp(vd->vdev_ops->vdev_op_type, VDEV_TYPE_DISK) != 0) { 3445 error = SET_ERROR(ENOTBLK); 3446 vdev_free(vd); 3447 goto out; 3448 } 3449#endif 3450 vd->vdev_top = vd; 3451 3452 if ((error = vdev_open(vd)) == 0 && 3453 (error = vdev_label_init(vd, crtxg, label)) == 0) { 3454 VERIFY(nvlist_add_uint64(dev[i], ZPOOL_CONFIG_GUID, 3455 vd->vdev_guid) == 0); 3456 } 3457 3458 vdev_free(vd); 3459 3460 if (error && 3461 (mode != VDEV_ALLOC_SPARE && mode != VDEV_ALLOC_L2CACHE)) 3462 goto out; 3463 else 3464 error = 0; 3465 } 3466 3467out: 3468 sav->sav_pending = NULL; 3469 sav->sav_npending = 0; 3470 return (error); 3471} 3472 3473static int 3474spa_validate_aux(spa_t *spa, nvlist_t *nvroot, uint64_t crtxg, int mode) 3475{ 3476 int error; 3477 3478 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 3479 3480 if ((error = spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3481 &spa->spa_spares, ZPOOL_CONFIG_SPARES, SPA_VERSION_SPARES, 3482 VDEV_LABEL_SPARE)) != 0) { 3483 return (error); 3484 } 3485 3486 return (spa_validate_aux_devs(spa, nvroot, crtxg, mode, 3487 &spa->spa_l2cache, ZPOOL_CONFIG_L2CACHE, SPA_VERSION_L2CACHE, 3488 VDEV_LABEL_L2CACHE)); 3489} 3490 3491static void 3492spa_set_aux_vdevs(spa_aux_vdev_t *sav, nvlist_t **devs, int ndevs, 3493 const char *config) 3494{ 3495 int i; 3496 3497 if (sav->sav_config != NULL) { 3498 nvlist_t **olddevs; 3499 uint_t oldndevs; 3500 nvlist_t **newdevs; 3501 3502 /* 3503 * Generate new dev list by concatentating with the 3504 * current dev list. 3505 */ 3506 VERIFY(nvlist_lookup_nvlist_array(sav->sav_config, config, 3507 &olddevs, &oldndevs) == 0); 3508 3509 newdevs = kmem_alloc(sizeof (void *) * 3510 (ndevs + oldndevs), KM_SLEEP); 3511 for (i = 0; i < oldndevs; i++) 3512 VERIFY(nvlist_dup(olddevs[i], &newdevs[i], 3513 KM_SLEEP) == 0); 3514 for (i = 0; i < ndevs; i++) 3515 VERIFY(nvlist_dup(devs[i], &newdevs[i + oldndevs], 3516 KM_SLEEP) == 0); 3517 3518 VERIFY(nvlist_remove(sav->sav_config, config, 3519 DATA_TYPE_NVLIST_ARRAY) == 0); 3520 3521 VERIFY(nvlist_add_nvlist_array(sav->sav_config, 3522 config, newdevs, ndevs + oldndevs) == 0); 3523 for (i = 0; i < oldndevs + ndevs; i++) 3524 nvlist_free(newdevs[i]); 3525 kmem_free(newdevs, (oldndevs + ndevs) * sizeof (void *)); 3526 } else { 3527 /* 3528 * Generate a new dev list. 3529 */ 3530 VERIFY(nvlist_alloc(&sav->sav_config, NV_UNIQUE_NAME, 3531 KM_SLEEP) == 0); 3532 VERIFY(nvlist_add_nvlist_array(sav->sav_config, config, 3533 devs, ndevs) == 0); 3534 } 3535} 3536 3537/* 3538 * Stop and drop level 2 ARC devices 3539 */ 3540void 3541spa_l2cache_drop(spa_t *spa) 3542{ 3543 vdev_t *vd; 3544 int i; 3545 spa_aux_vdev_t *sav = &spa->spa_l2cache; 3546 3547 for (i = 0; i < sav->sav_count; i++) { 3548 uint64_t pool; 3549 3550 vd = sav->sav_vdevs[i]; 3551 ASSERT(vd != NULL); 3552 3553 if (spa_l2cache_exists(vd->vdev_guid, &pool) && 3554 pool != 0ULL && l2arc_vdev_present(vd)) 3555 l2arc_remove_vdev(vd); 3556 } 3557} 3558 3559/* 3560 * Pool Creation 3561 */ 3562int 3563spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props, 3564 nvlist_t *zplprops) 3565{ 3566 spa_t *spa; 3567 char *altroot = NULL; 3568 vdev_t *rvd; 3569 dsl_pool_t *dp; 3570 dmu_tx_t *tx; 3571 int error = 0; 3572 uint64_t txg = TXG_INITIAL; 3573 nvlist_t **spares, **l2cache; 3574 uint_t nspares, nl2cache; 3575 uint64_t version, obj; 3576 boolean_t has_features; 3577 3578 /* 3579 * If this pool already exists, return failure. 3580 */ 3581 mutex_enter(&spa_namespace_lock); 3582 if (spa_lookup(pool) != NULL) { 3583 mutex_exit(&spa_namespace_lock); 3584 return (SET_ERROR(EEXIST)); 3585 } 3586 3587 /* 3588 * Allocate a new spa_t structure. 3589 */ 3590 (void) nvlist_lookup_string(props, 3591 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 3592 spa = spa_add(pool, NULL, altroot); 3593 spa_activate(spa, spa_mode_global); 3594 3595 if (props && (error = spa_prop_validate(spa, props))) { 3596 spa_deactivate(spa); 3597 spa_remove(spa); 3598 mutex_exit(&spa_namespace_lock); 3599 return (error); 3600 } 3601 3602 has_features = B_FALSE; 3603 for (nvpair_t *elem = nvlist_next_nvpair(props, NULL); 3604 elem != NULL; elem = nvlist_next_nvpair(props, elem)) { 3605 if (zpool_prop_feature(nvpair_name(elem))) 3606 has_features = B_TRUE; 3607 } 3608 3609 if (has_features || nvlist_lookup_uint64(props, 3610 zpool_prop_to_name(ZPOOL_PROP_VERSION), &version) != 0) { 3611 version = SPA_VERSION; 3612 } 3613 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 3614 3615 spa->spa_first_txg = txg; 3616 spa->spa_uberblock.ub_txg = txg - 1; 3617 spa->spa_uberblock.ub_version = version; 3618 spa->spa_ubsync = spa->spa_uberblock; 3619 3620 /* 3621 * Create "The Godfather" zio to hold all async IOs 3622 */ 3623 spa->spa_async_zio_root = kmem_alloc(max_ncpus * sizeof (void *), 3624 KM_SLEEP); 3625 for (int i = 0; i < max_ncpus; i++) { 3626 spa->spa_async_zio_root[i] = zio_root(spa, NULL, NULL, 3627 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE | 3628 ZIO_FLAG_GODFATHER); 3629 } 3630 3631 /* 3632 * Create the root vdev. 3633 */ 3634 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3635 3636 error = spa_config_parse(spa, &rvd, nvroot, NULL, 0, VDEV_ALLOC_ADD); 3637 3638 ASSERT(error != 0 || rvd != NULL); 3639 ASSERT(error != 0 || spa->spa_root_vdev == rvd); 3640 3641 if (error == 0 && !zfs_allocatable_devs(nvroot)) 3642 error = SET_ERROR(EINVAL); 3643 3644 if (error == 0 && 3645 (error = vdev_create(rvd, txg, B_FALSE)) == 0 && 3646 (error = spa_validate_aux(spa, nvroot, txg, 3647 VDEV_ALLOC_ADD)) == 0) { 3648 for (int c = 0; c < rvd->vdev_children; c++) { 3649 vdev_ashift_optimize(rvd->vdev_child[c]); 3650 vdev_metaslab_set_size(rvd->vdev_child[c]); 3651 vdev_expand(rvd->vdev_child[c], txg); 3652 } 3653 } 3654 3655 spa_config_exit(spa, SCL_ALL, FTAG); 3656 3657 if (error != 0) { 3658 spa_unload(spa); 3659 spa_deactivate(spa); 3660 spa_remove(spa); 3661 mutex_exit(&spa_namespace_lock); 3662 return (error); 3663 } 3664 3665 /* 3666 * Get the list of spares, if specified. 3667 */ 3668 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 3669 &spares, &nspares) == 0) { 3670 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, NV_UNIQUE_NAME, 3671 KM_SLEEP) == 0); 3672 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 3673 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 3674 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3675 spa_load_spares(spa); 3676 spa_config_exit(spa, SCL_ALL, FTAG); 3677 spa->spa_spares.sav_sync = B_TRUE; 3678 } 3679 3680 /* 3681 * Get the list of level 2 cache devices, if specified. 3682 */ 3683 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 3684 &l2cache, &nl2cache) == 0) { 3685 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 3686 NV_UNIQUE_NAME, KM_SLEEP) == 0); 3687 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 3688 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 3689 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3690 spa_load_l2cache(spa); 3691 spa_config_exit(spa, SCL_ALL, FTAG); 3692 spa->spa_l2cache.sav_sync = B_TRUE; 3693 } 3694 3695 spa->spa_is_initializing = B_TRUE; 3696 spa->spa_dsl_pool = dp = dsl_pool_create(spa, zplprops, txg); 3697 spa->spa_meta_objset = dp->dp_meta_objset; 3698 spa->spa_is_initializing = B_FALSE; 3699 3700 /* 3701 * Create DDTs (dedup tables). 3702 */ 3703 ddt_create(spa); 3704 3705 spa_update_dspace(spa); 3706 3707 tx = dmu_tx_create_assigned(dp, txg); 3708 3709 /* 3710 * Create the pool config object. 3711 */ 3712 spa->spa_config_object = dmu_object_alloc(spa->spa_meta_objset, 3713 DMU_OT_PACKED_NVLIST, SPA_CONFIG_BLOCKSIZE, 3714 DMU_OT_PACKED_NVLIST_SIZE, sizeof (uint64_t), tx); 3715 3716 if (zap_add(spa->spa_meta_objset, 3717 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CONFIG, 3718 sizeof (uint64_t), 1, &spa->spa_config_object, tx) != 0) { 3719 cmn_err(CE_PANIC, "failed to add pool config"); 3720 } 3721 3722 if (spa_version(spa) >= SPA_VERSION_FEATURES) 3723 spa_feature_create_zap_objects(spa, tx); 3724 3725 if (zap_add(spa->spa_meta_objset, 3726 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CREATION_VERSION, 3727 sizeof (uint64_t), 1, &version, tx) != 0) { 3728 cmn_err(CE_PANIC, "failed to add pool version"); 3729 } 3730 3731 /* Newly created pools with the right version are always deflated. */ 3732 if (version >= SPA_VERSION_RAIDZ_DEFLATE) { 3733 spa->spa_deflate = TRUE; 3734 if (zap_add(spa->spa_meta_objset, 3735 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 3736 sizeof (uint64_t), 1, &spa->spa_deflate, tx) != 0) { 3737 cmn_err(CE_PANIC, "failed to add deflate"); 3738 } 3739 } 3740 3741 /* 3742 * Create the deferred-free bpobj. Turn off compression 3743 * because sync-to-convergence takes longer if the blocksize 3744 * keeps changing. 3745 */ 3746 obj = bpobj_alloc(spa->spa_meta_objset, 1 << 14, tx); 3747 dmu_object_set_compress(spa->spa_meta_objset, obj, 3748 ZIO_COMPRESS_OFF, tx); 3749 if (zap_add(spa->spa_meta_objset, 3750 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_SYNC_BPOBJ, 3751 sizeof (uint64_t), 1, &obj, tx) != 0) { 3752 cmn_err(CE_PANIC, "failed to add bpobj"); 3753 } 3754 VERIFY3U(0, ==, bpobj_open(&spa->spa_deferred_bpobj, 3755 spa->spa_meta_objset, obj)); 3756 3757 /* 3758 * Create the pool's history object. 3759 */ 3760 if (version >= SPA_VERSION_ZPOOL_HISTORY) 3761 spa_history_create_obj(spa, tx); 3762 3763 /* 3764 * Generate some random noise for salted checksums to operate on. 3765 */ 3766 (void) random_get_pseudo_bytes(spa->spa_cksum_salt.zcs_bytes, 3767 sizeof (spa->spa_cksum_salt.zcs_bytes)); 3768 3769 /* 3770 * Set pool properties. 3771 */ 3772 spa->spa_bootfs = zpool_prop_default_numeric(ZPOOL_PROP_BOOTFS); 3773 spa->spa_delegation = zpool_prop_default_numeric(ZPOOL_PROP_DELEGATION); 3774 spa->spa_failmode = zpool_prop_default_numeric(ZPOOL_PROP_FAILUREMODE); 3775 spa->spa_autoexpand = zpool_prop_default_numeric(ZPOOL_PROP_AUTOEXPAND); 3776 3777 if (props != NULL) { 3778 spa_configfile_set(spa, props, B_FALSE); 3779 spa_sync_props(props, tx); 3780 } 3781 3782 dmu_tx_commit(tx); 3783 3784 spa->spa_sync_on = B_TRUE; 3785 txg_sync_start(spa->spa_dsl_pool); 3786 3787 /* 3788 * We explicitly wait for the first transaction to complete so that our 3789 * bean counters are appropriately updated. 3790 */ 3791 txg_wait_synced(spa->spa_dsl_pool, txg); 3792 3793 spa_config_sync(spa, B_FALSE, B_TRUE); 3794 spa_event_notify(spa, NULL, ESC_ZFS_POOL_CREATE); 3795 3796 spa_history_log_version(spa, "create"); 3797 3798 /* 3799 * Don't count references from objsets that are already closed 3800 * and are making their way through the eviction process. 3801 */ 3802 spa_evicting_os_wait(spa); 3803 spa->spa_minref = refcount_count(&spa->spa_refcount); 3804 3805 mutex_exit(&spa_namespace_lock); 3806 3807 return (0); 3808} 3809 3810#ifdef _KERNEL 3811#if defined(sun) 3812/* 3813 * Get the root pool information from the root disk, then import the root pool 3814 * during the system boot up time. 3815 */ 3816extern int vdev_disk_read_rootlabel(char *, char *, nvlist_t **); 3817 3818static nvlist_t * 3819spa_generate_rootconf(char *devpath, char *devid, uint64_t *guid) 3820{ 3821 nvlist_t *config; 3822 nvlist_t *nvtop, *nvroot; 3823 uint64_t pgid; 3824 3825 if (vdev_disk_read_rootlabel(devpath, devid, &config) != 0) 3826 return (NULL); 3827 3828 /* 3829 * Add this top-level vdev to the child array. 3830 */ 3831 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3832 &nvtop) == 0); 3833 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 3834 &pgid) == 0); 3835 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_GUID, guid) == 0); 3836 3837 /* 3838 * Put this pool's top-level vdevs into a root vdev. 3839 */ 3840 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 3841 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 3842 VDEV_TYPE_ROOT) == 0); 3843 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 3844 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 3845 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 3846 &nvtop, 1) == 0); 3847 3848 /* 3849 * Replace the existing vdev_tree with the new root vdev in 3850 * this pool's configuration (remove the old, add the new). 3851 */ 3852 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 3853 nvlist_free(nvroot); 3854 return (config); 3855} 3856 3857/* 3858 * Walk the vdev tree and see if we can find a device with "better" 3859 * configuration. A configuration is "better" if the label on that 3860 * device has a more recent txg. 3861 */ 3862static void 3863spa_alt_rootvdev(vdev_t *vd, vdev_t **avd, uint64_t *txg) 3864{ 3865 for (int c = 0; c < vd->vdev_children; c++) 3866 spa_alt_rootvdev(vd->vdev_child[c], avd, txg); 3867 3868 if (vd->vdev_ops->vdev_op_leaf) { 3869 nvlist_t *label; 3870 uint64_t label_txg; 3871 3872 if (vdev_disk_read_rootlabel(vd->vdev_physpath, vd->vdev_devid, 3873 &label) != 0) 3874 return; 3875 3876 VERIFY(nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 3877 &label_txg) == 0); 3878 3879 /* 3880 * Do we have a better boot device? 3881 */ 3882 if (label_txg > *txg) { 3883 *txg = label_txg; 3884 *avd = vd; 3885 } 3886 nvlist_free(label); 3887 } 3888} 3889 3890/* 3891 * Import a root pool. 3892 * 3893 * For x86. devpath_list will consist of devid and/or physpath name of 3894 * the vdev (e.g. "id1,sd@SSEAGATE..." or "/pci@1f,0/ide@d/disk@0,0:a"). 3895 * The GRUB "findroot" command will return the vdev we should boot. 3896 * 3897 * For Sparc, devpath_list consists the physpath name of the booting device 3898 * no matter the rootpool is a single device pool or a mirrored pool. 3899 * e.g. 3900 * "/pci@1f,0/ide@d/disk@0,0:a" 3901 */ 3902int 3903spa_import_rootpool(char *devpath, char *devid) 3904{ 3905 spa_t *spa; 3906 vdev_t *rvd, *bvd, *avd = NULL; 3907 nvlist_t *config, *nvtop; 3908 uint64_t guid, txg; 3909 char *pname; 3910 int error; 3911 3912 /* 3913 * Read the label from the boot device and generate a configuration. 3914 */ 3915 config = spa_generate_rootconf(devpath, devid, &guid); 3916#if defined(_OBP) && defined(_KERNEL) 3917 if (config == NULL) { 3918 if (strstr(devpath, "/iscsi/ssd") != NULL) { 3919 /* iscsi boot */ 3920 get_iscsi_bootpath_phy(devpath); 3921 config = spa_generate_rootconf(devpath, devid, &guid); 3922 } 3923 } 3924#endif 3925 if (config == NULL) { 3926 cmn_err(CE_NOTE, "Cannot read the pool label from '%s'", 3927 devpath); 3928 return (SET_ERROR(EIO)); 3929 } 3930 3931 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 3932 &pname) == 0); 3933 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) == 0); 3934 3935 mutex_enter(&spa_namespace_lock); 3936 if ((spa = spa_lookup(pname)) != NULL) { 3937 /* 3938 * Remove the existing root pool from the namespace so that we 3939 * can replace it with the correct config we just read in. 3940 */ 3941 spa_remove(spa); 3942 } 3943 3944 spa = spa_add(pname, config, NULL); 3945 spa->spa_is_root = B_TRUE; 3946 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 3947 3948 /* 3949 * Build up a vdev tree based on the boot device's label config. 3950 */ 3951 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 3952 &nvtop) == 0); 3953 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 3954 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 3955 VDEV_ALLOC_ROOTPOOL); 3956 spa_config_exit(spa, SCL_ALL, FTAG); 3957 if (error) { 3958 mutex_exit(&spa_namespace_lock); 3959 nvlist_free(config); 3960 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 3961 pname); 3962 return (error); 3963 } 3964 3965 /* 3966 * Get the boot vdev. 3967 */ 3968 if ((bvd = vdev_lookup_by_guid(rvd, guid)) == NULL) { 3969 cmn_err(CE_NOTE, "Can not find the boot vdev for guid %llu", 3970 (u_longlong_t)guid); 3971 error = SET_ERROR(ENOENT); 3972 goto out; 3973 } 3974 3975 /* 3976 * Determine if there is a better boot device. 3977 */ 3978 avd = bvd; 3979 spa_alt_rootvdev(rvd, &avd, &txg); 3980 if (avd != bvd) { 3981 cmn_err(CE_NOTE, "The boot device is 'degraded'. Please " 3982 "try booting from '%s'", avd->vdev_path); 3983 error = SET_ERROR(EINVAL); 3984 goto out; 3985 } 3986 3987 /* 3988 * If the boot device is part of a spare vdev then ensure that 3989 * we're booting off the active spare. 3990 */ 3991 if (bvd->vdev_parent->vdev_ops == &vdev_spare_ops && 3992 !bvd->vdev_isspare) { 3993 cmn_err(CE_NOTE, "The boot device is currently spared. Please " 3994 "try booting from '%s'", 3995 bvd->vdev_parent-> 3996 vdev_child[bvd->vdev_parent->vdev_children - 1]->vdev_path); 3997 error = SET_ERROR(EINVAL); 3998 goto out; 3999 } 4000 4001 error = 0; 4002out: 4003 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4004 vdev_free(rvd); 4005 spa_config_exit(spa, SCL_ALL, FTAG); 4006 mutex_exit(&spa_namespace_lock); 4007 4008 nvlist_free(config); 4009 return (error); 4010} 4011 4012#else 4013 4014extern int vdev_geom_read_pool_label(const char *name, nvlist_t ***configs, 4015 uint64_t *count); 4016 4017static nvlist_t * 4018spa_generate_rootconf(const char *name) 4019{ 4020 nvlist_t **configs, **tops; 4021 nvlist_t *config; 4022 nvlist_t *best_cfg, *nvtop, *nvroot; 4023 uint64_t *holes; 4024 uint64_t best_txg; 4025 uint64_t nchildren; 4026 uint64_t pgid; 4027 uint64_t count; 4028 uint64_t i; 4029 uint_t nholes; 4030 4031 if (vdev_geom_read_pool_label(name, &configs, &count) != 0) 4032 return (NULL); 4033 4034 ASSERT3U(count, !=, 0); 4035 best_txg = 0; 4036 for (i = 0; i < count; i++) { 4037 uint64_t txg; 4038 4039 VERIFY(nvlist_lookup_uint64(configs[i], ZPOOL_CONFIG_POOL_TXG, 4040 &txg) == 0); 4041 if (txg > best_txg) { 4042 best_txg = txg; 4043 best_cfg = configs[i]; 4044 } 4045 } 4046 4047 /* 4048 * Multi-vdev root pool configuration discovery is not supported yet. 4049 */ 4050 nchildren = 1; 4051 nvlist_lookup_uint64(best_cfg, ZPOOL_CONFIG_VDEV_CHILDREN, &nchildren); 4052 holes = NULL; 4053 nvlist_lookup_uint64_array(best_cfg, ZPOOL_CONFIG_HOLE_ARRAY, 4054 &holes, &nholes); 4055 4056 tops = kmem_zalloc(nchildren * sizeof(void *), KM_SLEEP); 4057 for (i = 0; i < nchildren; i++) { 4058 if (i >= count) 4059 break; 4060 if (configs[i] == NULL) 4061 continue; 4062 VERIFY(nvlist_lookup_nvlist(configs[i], ZPOOL_CONFIG_VDEV_TREE, 4063 &nvtop) == 0); 4064 nvlist_dup(nvtop, &tops[i], KM_SLEEP); 4065 } 4066 for (i = 0; holes != NULL && i < nholes; i++) { 4067 if (i >= nchildren) 4068 continue; 4069 if (tops[holes[i]] != NULL) 4070 continue; 4071 nvlist_alloc(&tops[holes[i]], NV_UNIQUE_NAME, KM_SLEEP); 4072 VERIFY(nvlist_add_string(tops[holes[i]], ZPOOL_CONFIG_TYPE, 4073 VDEV_TYPE_HOLE) == 0); 4074 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_ID, 4075 holes[i]) == 0); 4076 VERIFY(nvlist_add_uint64(tops[holes[i]], ZPOOL_CONFIG_GUID, 4077 0) == 0); 4078 } 4079 for (i = 0; i < nchildren; i++) { 4080 if (tops[i] != NULL) 4081 continue; 4082 nvlist_alloc(&tops[i], NV_UNIQUE_NAME, KM_SLEEP); 4083 VERIFY(nvlist_add_string(tops[i], ZPOOL_CONFIG_TYPE, 4084 VDEV_TYPE_MISSING) == 0); 4085 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_ID, 4086 i) == 0); 4087 VERIFY(nvlist_add_uint64(tops[i], ZPOOL_CONFIG_GUID, 4088 0) == 0); 4089 } 4090 4091 /* 4092 * Create pool config based on the best vdev config. 4093 */ 4094 nvlist_dup(best_cfg, &config, KM_SLEEP); 4095 4096 /* 4097 * Put this pool's top-level vdevs into a root vdev. 4098 */ 4099 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_GUID, 4100 &pgid) == 0); 4101 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 4102 VERIFY(nvlist_add_string(nvroot, ZPOOL_CONFIG_TYPE, 4103 VDEV_TYPE_ROOT) == 0); 4104 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_ID, 0ULL) == 0); 4105 VERIFY(nvlist_add_uint64(nvroot, ZPOOL_CONFIG_GUID, pgid) == 0); 4106 VERIFY(nvlist_add_nvlist_array(nvroot, ZPOOL_CONFIG_CHILDREN, 4107 tops, nchildren) == 0); 4108 4109 /* 4110 * Replace the existing vdev_tree with the new root vdev in 4111 * this pool's configuration (remove the old, add the new). 4112 */ 4113 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, nvroot) == 0); 4114 4115 /* 4116 * Drop vdev config elements that should not be present at pool level. 4117 */ 4118 nvlist_remove(config, ZPOOL_CONFIG_GUID, DATA_TYPE_UINT64); 4119 nvlist_remove(config, ZPOOL_CONFIG_TOP_GUID, DATA_TYPE_UINT64); 4120 4121 for (i = 0; i < count; i++) 4122 nvlist_free(configs[i]); 4123 kmem_free(configs, count * sizeof(void *)); 4124 for (i = 0; i < nchildren; i++) 4125 nvlist_free(tops[i]); 4126 kmem_free(tops, nchildren * sizeof(void *)); 4127 nvlist_free(nvroot); 4128 return (config); 4129} 4130 4131int 4132spa_import_rootpool(const char *name) 4133{ 4134 spa_t *spa; 4135 vdev_t *rvd, *bvd, *avd = NULL; 4136 nvlist_t *config, *nvtop; 4137 uint64_t txg; 4138 char *pname; 4139 int error; 4140 4141 /* 4142 * Read the label from the boot device and generate a configuration. 4143 */ 4144 config = spa_generate_rootconf(name); 4145 4146 mutex_enter(&spa_namespace_lock); 4147 if (config != NULL) { 4148 VERIFY(nvlist_lookup_string(config, ZPOOL_CONFIG_POOL_NAME, 4149 &pname) == 0 && strcmp(name, pname) == 0); 4150 VERIFY(nvlist_lookup_uint64(config, ZPOOL_CONFIG_POOL_TXG, &txg) 4151 == 0); 4152 4153 if ((spa = spa_lookup(pname)) != NULL) { 4154 /* 4155 * Remove the existing root pool from the namespace so 4156 * that we can replace it with the correct config 4157 * we just read in. 4158 */ 4159 spa_remove(spa); 4160 } 4161 spa = spa_add(pname, config, NULL); 4162 4163 /* 4164 * Set spa_ubsync.ub_version as it can be used in vdev_alloc() 4165 * via spa_version(). 4166 */ 4167 if (nvlist_lookup_uint64(config, ZPOOL_CONFIG_VERSION, 4168 &spa->spa_ubsync.ub_version) != 0) 4169 spa->spa_ubsync.ub_version = SPA_VERSION_INITIAL; 4170 } else if ((spa = spa_lookup(name)) == NULL) { 4171 mutex_exit(&spa_namespace_lock); 4172 nvlist_free(config); 4173 cmn_err(CE_NOTE, "Cannot find the pool label for '%s'", 4174 name); 4175 return (EIO); 4176 } else { 4177 VERIFY(nvlist_dup(spa->spa_config, &config, KM_SLEEP) == 0); 4178 } 4179 spa->spa_is_root = B_TRUE; 4180 spa->spa_import_flags = ZFS_IMPORT_VERBATIM; 4181 4182 /* 4183 * Build up a vdev tree based on the boot device's label config. 4184 */ 4185 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4186 &nvtop) == 0); 4187 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4188 error = spa_config_parse(spa, &rvd, nvtop, NULL, 0, 4189 VDEV_ALLOC_ROOTPOOL); 4190 spa_config_exit(spa, SCL_ALL, FTAG); 4191 if (error) { 4192 mutex_exit(&spa_namespace_lock); 4193 nvlist_free(config); 4194 cmn_err(CE_NOTE, "Can not parse the config for pool '%s'", 4195 pname); 4196 return (error); 4197 } 4198 4199 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4200 vdev_free(rvd); 4201 spa_config_exit(spa, SCL_ALL, FTAG); 4202 mutex_exit(&spa_namespace_lock); 4203 4204 nvlist_free(config); 4205 return (0); 4206} 4207 4208#endif /* sun */ 4209#endif 4210 4211/* 4212 * Import a non-root pool into the system. 4213 */ 4214int 4215spa_import(const char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags) 4216{ 4217 spa_t *spa; 4218 char *altroot = NULL; 4219 spa_load_state_t state = SPA_LOAD_IMPORT; 4220 zpool_rewind_policy_t policy; 4221 uint64_t mode = spa_mode_global; 4222 uint64_t readonly = B_FALSE; 4223 int error; 4224 nvlist_t *nvroot; 4225 nvlist_t **spares, **l2cache; 4226 uint_t nspares, nl2cache; 4227 4228 /* 4229 * If a pool with this name exists, return failure. 4230 */ 4231 mutex_enter(&spa_namespace_lock); 4232 if (spa_lookup(pool) != NULL) { 4233 mutex_exit(&spa_namespace_lock); 4234 return (SET_ERROR(EEXIST)); 4235 } 4236 4237 /* 4238 * Create and initialize the spa structure. 4239 */ 4240 (void) nvlist_lookup_string(props, 4241 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 4242 (void) nvlist_lookup_uint64(props, 4243 zpool_prop_to_name(ZPOOL_PROP_READONLY), &readonly); 4244 if (readonly) 4245 mode = FREAD; 4246 spa = spa_add(pool, config, altroot); 4247 spa->spa_import_flags = flags; 4248 4249 /* 4250 * Verbatim import - Take a pool and insert it into the namespace 4251 * as if it had been loaded at boot. 4252 */ 4253 if (spa->spa_import_flags & ZFS_IMPORT_VERBATIM) { 4254 if (props != NULL) 4255 spa_configfile_set(spa, props, B_FALSE); 4256 4257 spa_config_sync(spa, B_FALSE, B_TRUE); 4258 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4259 4260 mutex_exit(&spa_namespace_lock); 4261 return (0); 4262 } 4263 4264 spa_activate(spa, mode); 4265 4266 /* 4267 * Don't start async tasks until we know everything is healthy. 4268 */ 4269 spa_async_suspend(spa); 4270 4271 zpool_get_rewind_policy(config, &policy); 4272 if (policy.zrp_request & ZPOOL_DO_REWIND) 4273 state = SPA_LOAD_RECOVER; 4274 4275 /* 4276 * Pass off the heavy lifting to spa_load(). Pass TRUE for mosconfig 4277 * because the user-supplied config is actually the one to trust when 4278 * doing an import. 4279 */ 4280 if (state != SPA_LOAD_RECOVER) 4281 spa->spa_last_ubsync_txg = spa->spa_load_txg = 0; 4282 4283 error = spa_load_best(spa, state, B_TRUE, policy.zrp_txg, 4284 policy.zrp_request); 4285 4286 /* 4287 * Propagate anything learned while loading the pool and pass it 4288 * back to caller (i.e. rewind info, missing devices, etc). 4289 */ 4290 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4291 spa->spa_load_info) == 0); 4292 4293 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4294 /* 4295 * Toss any existing sparelist, as it doesn't have any validity 4296 * anymore, and conflicts with spa_has_spare(). 4297 */ 4298 if (spa->spa_spares.sav_config) { 4299 nvlist_free(spa->spa_spares.sav_config); 4300 spa->spa_spares.sav_config = NULL; 4301 spa_load_spares(spa); 4302 } 4303 if (spa->spa_l2cache.sav_config) { 4304 nvlist_free(spa->spa_l2cache.sav_config); 4305 spa->spa_l2cache.sav_config = NULL; 4306 spa_load_l2cache(spa); 4307 } 4308 4309 VERIFY(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, 4310 &nvroot) == 0); 4311 if (error == 0) 4312 error = spa_validate_aux(spa, nvroot, -1ULL, 4313 VDEV_ALLOC_SPARE); 4314 if (error == 0) 4315 error = spa_validate_aux(spa, nvroot, -1ULL, 4316 VDEV_ALLOC_L2CACHE); 4317 spa_config_exit(spa, SCL_ALL, FTAG); 4318 4319 if (props != NULL) 4320 spa_configfile_set(spa, props, B_FALSE); 4321 4322 if (error != 0 || (props && spa_writeable(spa) && 4323 (error = spa_prop_set(spa, props)))) { 4324 spa_unload(spa); 4325 spa_deactivate(spa); 4326 spa_remove(spa); 4327 mutex_exit(&spa_namespace_lock); 4328 return (error); 4329 } 4330 4331 spa_async_resume(spa); 4332 4333 /* 4334 * Override any spares and level 2 cache devices as specified by 4335 * the user, as these may have correct device names/devids, etc. 4336 */ 4337 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, 4338 &spares, &nspares) == 0) { 4339 if (spa->spa_spares.sav_config) 4340 VERIFY(nvlist_remove(spa->spa_spares.sav_config, 4341 ZPOOL_CONFIG_SPARES, DATA_TYPE_NVLIST_ARRAY) == 0); 4342 else 4343 VERIFY(nvlist_alloc(&spa->spa_spares.sav_config, 4344 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4345 VERIFY(nvlist_add_nvlist_array(spa->spa_spares.sav_config, 4346 ZPOOL_CONFIG_SPARES, spares, nspares) == 0); 4347 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4348 spa_load_spares(spa); 4349 spa_config_exit(spa, SCL_ALL, FTAG); 4350 spa->spa_spares.sav_sync = B_TRUE; 4351 } 4352 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, 4353 &l2cache, &nl2cache) == 0) { 4354 if (spa->spa_l2cache.sav_config) 4355 VERIFY(nvlist_remove(spa->spa_l2cache.sav_config, 4356 ZPOOL_CONFIG_L2CACHE, DATA_TYPE_NVLIST_ARRAY) == 0); 4357 else 4358 VERIFY(nvlist_alloc(&spa->spa_l2cache.sav_config, 4359 NV_UNIQUE_NAME, KM_SLEEP) == 0); 4360 VERIFY(nvlist_add_nvlist_array(spa->spa_l2cache.sav_config, 4361 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache) == 0); 4362 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4363 spa_load_l2cache(spa); 4364 spa_config_exit(spa, SCL_ALL, FTAG); 4365 spa->spa_l2cache.sav_sync = B_TRUE; 4366 } 4367 4368 /* 4369 * Check for any removed devices. 4370 */ 4371 if (spa->spa_autoreplace) { 4372 spa_aux_check_removed(&spa->spa_spares); 4373 spa_aux_check_removed(&spa->spa_l2cache); 4374 } 4375 4376 if (spa_writeable(spa)) { 4377 /* 4378 * Update the config cache to include the newly-imported pool. 4379 */ 4380 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4381 } 4382 4383 /* 4384 * It's possible that the pool was expanded while it was exported. 4385 * We kick off an async task to handle this for us. 4386 */ 4387 spa_async_request(spa, SPA_ASYNC_AUTOEXPAND); 4388 4389 spa_history_log_version(spa, "import"); 4390 4391 spa_event_notify(spa, NULL, ESC_ZFS_POOL_IMPORT); 4392 4393 mutex_exit(&spa_namespace_lock); 4394 4395#ifdef __FreeBSD__ 4396#ifdef _KERNEL 4397 zvol_create_minors(pool); 4398#endif 4399#endif 4400 return (0); 4401} 4402 4403nvlist_t * 4404spa_tryimport(nvlist_t *tryconfig) 4405{ 4406 nvlist_t *config = NULL; 4407 char *poolname; 4408 spa_t *spa; 4409 uint64_t state; 4410 int error; 4411 4412 if (nvlist_lookup_string(tryconfig, ZPOOL_CONFIG_POOL_NAME, &poolname)) 4413 return (NULL); 4414 4415 if (nvlist_lookup_uint64(tryconfig, ZPOOL_CONFIG_POOL_STATE, &state)) 4416 return (NULL); 4417 4418 /* 4419 * Create and initialize the spa structure. 4420 */ 4421 mutex_enter(&spa_namespace_lock); 4422 spa = spa_add(TRYIMPORT_NAME, tryconfig, NULL); 4423 spa_activate(spa, FREAD); 4424 4425 /* 4426 * Pass off the heavy lifting to spa_load(). 4427 * Pass TRUE for mosconfig because the user-supplied config 4428 * is actually the one to trust when doing an import. 4429 */ 4430 error = spa_load(spa, SPA_LOAD_TRYIMPORT, SPA_IMPORT_EXISTING, B_TRUE); 4431 4432 /* 4433 * If 'tryconfig' was at least parsable, return the current config. 4434 */ 4435 if (spa->spa_root_vdev != NULL) { 4436 config = spa_config_generate(spa, NULL, -1ULL, B_TRUE); 4437 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, 4438 poolname) == 0); 4439 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 4440 state) == 0); 4441 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_TIMESTAMP, 4442 spa->spa_uberblock.ub_timestamp) == 0); 4443 VERIFY(nvlist_add_nvlist(config, ZPOOL_CONFIG_LOAD_INFO, 4444 spa->spa_load_info) == 0); 4445 4446 /* 4447 * If the bootfs property exists on this pool then we 4448 * copy it out so that external consumers can tell which 4449 * pools are bootable. 4450 */ 4451 if ((!error || error == EEXIST) && spa->spa_bootfs) { 4452 char *tmpname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4453 4454 /* 4455 * We have to play games with the name since the 4456 * pool was opened as TRYIMPORT_NAME. 4457 */ 4458 if (dsl_dsobj_to_dsname(spa_name(spa), 4459 spa->spa_bootfs, tmpname) == 0) { 4460 char *cp; 4461 char *dsname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 4462 4463 cp = strchr(tmpname, '/'); 4464 if (cp == NULL) { 4465 (void) strlcpy(dsname, tmpname, 4466 MAXPATHLEN); 4467 } else { 4468 (void) snprintf(dsname, MAXPATHLEN, 4469 "%s/%s", poolname, ++cp); 4470 } 4471 VERIFY(nvlist_add_string(config, 4472 ZPOOL_CONFIG_BOOTFS, dsname) == 0); 4473 kmem_free(dsname, MAXPATHLEN); 4474 } 4475 kmem_free(tmpname, MAXPATHLEN); 4476 } 4477 4478 /* 4479 * Add the list of hot spares and level 2 cache devices. 4480 */ 4481 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 4482 spa_add_spares(spa, config); 4483 spa_add_l2cache(spa, config); 4484 spa_config_exit(spa, SCL_CONFIG, FTAG); 4485 } 4486 4487 spa_unload(spa); 4488 spa_deactivate(spa); 4489 spa_remove(spa); 4490 mutex_exit(&spa_namespace_lock); 4491 4492 return (config); 4493} 4494 4495/* 4496 * Pool export/destroy 4497 * 4498 * The act of destroying or exporting a pool is very simple. We make sure there 4499 * is no more pending I/O and any references to the pool are gone. Then, we 4500 * update the pool state and sync all the labels to disk, removing the 4501 * configuration from the cache afterwards. If the 'hardforce' flag is set, then 4502 * we don't sync the labels or remove the configuration cache. 4503 */ 4504static int 4505spa_export_common(char *pool, int new_state, nvlist_t **oldconfig, 4506 boolean_t force, boolean_t hardforce) 4507{ 4508 spa_t *spa; 4509 4510 if (oldconfig) 4511 *oldconfig = NULL; 4512 4513 if (!(spa_mode_global & FWRITE)) 4514 return (SET_ERROR(EROFS)); 4515 4516 mutex_enter(&spa_namespace_lock); 4517 if ((spa = spa_lookup(pool)) == NULL) { 4518 mutex_exit(&spa_namespace_lock); 4519 return (SET_ERROR(ENOENT)); 4520 } 4521 4522 /* 4523 * Put a hold on the pool, drop the namespace lock, stop async tasks, 4524 * reacquire the namespace lock, and see if we can export. 4525 */ 4526 spa_open_ref(spa, FTAG); 4527 mutex_exit(&spa_namespace_lock); 4528 spa_async_suspend(spa); 4529 mutex_enter(&spa_namespace_lock); 4530 spa_close(spa, FTAG); 4531 4532 /* 4533 * The pool will be in core if it's openable, 4534 * in which case we can modify its state. 4535 */ 4536 if (spa->spa_state != POOL_STATE_UNINITIALIZED && spa->spa_sync_on) { 4537 /* 4538 * Objsets may be open only because they're dirty, so we 4539 * have to force it to sync before checking spa_refcnt. 4540 */ 4541 txg_wait_synced(spa->spa_dsl_pool, 0); 4542 spa_evicting_os_wait(spa); 4543 4544 /* 4545 * A pool cannot be exported or destroyed if there are active 4546 * references. If we are resetting a pool, allow references by 4547 * fault injection handlers. 4548 */ 4549 if (!spa_refcount_zero(spa) || 4550 (spa->spa_inject_ref != 0 && 4551 new_state != POOL_STATE_UNINITIALIZED)) { 4552 spa_async_resume(spa); 4553 mutex_exit(&spa_namespace_lock); 4554 return (SET_ERROR(EBUSY)); 4555 } 4556 4557 /* 4558 * A pool cannot be exported if it has an active shared spare. 4559 * This is to prevent other pools stealing the active spare 4560 * from an exported pool. At user's own will, such pool can 4561 * be forcedly exported. 4562 */ 4563 if (!force && new_state == POOL_STATE_EXPORTED && 4564 spa_has_active_shared_spare(spa)) { 4565 spa_async_resume(spa); 4566 mutex_exit(&spa_namespace_lock); 4567 return (SET_ERROR(EXDEV)); 4568 } 4569 4570 /* 4571 * We want this to be reflected on every label, 4572 * so mark them all dirty. spa_unload() will do the 4573 * final sync that pushes these changes out. 4574 */ 4575 if (new_state != POOL_STATE_UNINITIALIZED && !hardforce) { 4576 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 4577 spa->spa_state = new_state; 4578 spa->spa_final_txg = spa_last_synced_txg(spa) + 4579 TXG_DEFER_SIZE + 1; 4580 vdev_config_dirty(spa->spa_root_vdev); 4581 spa_config_exit(spa, SCL_ALL, FTAG); 4582 } 4583 } 4584 4585 spa_event_notify(spa, NULL, ESC_ZFS_POOL_DESTROY); 4586 4587 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 4588 spa_unload(spa); 4589 spa_deactivate(spa); 4590 } 4591 4592 if (oldconfig && spa->spa_config) 4593 VERIFY(nvlist_dup(spa->spa_config, oldconfig, 0) == 0); 4594 4595 if (new_state != POOL_STATE_UNINITIALIZED) { 4596 if (!hardforce) 4597 spa_config_sync(spa, B_TRUE, B_TRUE); 4598 spa_remove(spa); 4599 } 4600 mutex_exit(&spa_namespace_lock); 4601 4602 return (0); 4603} 4604 4605/* 4606 * Destroy a storage pool. 4607 */ 4608int 4609spa_destroy(char *pool) 4610{ 4611 return (spa_export_common(pool, POOL_STATE_DESTROYED, NULL, 4612 B_FALSE, B_FALSE)); 4613} 4614 4615/* 4616 * Export a storage pool. 4617 */ 4618int 4619spa_export(char *pool, nvlist_t **oldconfig, boolean_t force, 4620 boolean_t hardforce) 4621{ 4622 return (spa_export_common(pool, POOL_STATE_EXPORTED, oldconfig, 4623 force, hardforce)); 4624} 4625 4626/* 4627 * Similar to spa_export(), this unloads the spa_t without actually removing it 4628 * from the namespace in any way. 4629 */ 4630int 4631spa_reset(char *pool) 4632{ 4633 return (spa_export_common(pool, POOL_STATE_UNINITIALIZED, NULL, 4634 B_FALSE, B_FALSE)); 4635} 4636 4637/* 4638 * ========================================================================== 4639 * Device manipulation 4640 * ========================================================================== 4641 */ 4642 4643/* 4644 * Add a device to a storage pool. 4645 */ 4646int 4647spa_vdev_add(spa_t *spa, nvlist_t *nvroot) 4648{ 4649 uint64_t txg, id; 4650 int error; 4651 vdev_t *rvd = spa->spa_root_vdev; 4652 vdev_t *vd, *tvd; 4653 nvlist_t **spares, **l2cache; 4654 uint_t nspares, nl2cache; 4655 4656 ASSERT(spa_writeable(spa)); 4657 4658 txg = spa_vdev_enter(spa); 4659 4660 if ((error = spa_config_parse(spa, &vd, nvroot, NULL, 0, 4661 VDEV_ALLOC_ADD)) != 0) 4662 return (spa_vdev_exit(spa, NULL, txg, error)); 4663 4664 spa->spa_pending_vdev = vd; /* spa_vdev_exit() will clear this */ 4665 4666 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_SPARES, &spares, 4667 &nspares) != 0) 4668 nspares = 0; 4669 4670 if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE, &l2cache, 4671 &nl2cache) != 0) 4672 nl2cache = 0; 4673 4674 if (vd->vdev_children == 0 && nspares == 0 && nl2cache == 0) 4675 return (spa_vdev_exit(spa, vd, txg, EINVAL)); 4676 4677 if (vd->vdev_children != 0 && 4678 (error = vdev_create(vd, txg, B_FALSE)) != 0) 4679 return (spa_vdev_exit(spa, vd, txg, error)); 4680 4681 /* 4682 * We must validate the spares and l2cache devices after checking the 4683 * children. Otherwise, vdev_inuse() will blindly overwrite the spare. 4684 */ 4685 if ((error = spa_validate_aux(spa, nvroot, txg, VDEV_ALLOC_ADD)) != 0) 4686 return (spa_vdev_exit(spa, vd, txg, error)); 4687 4688 /* 4689 * Transfer each new top-level vdev from vd to rvd. 4690 */ 4691 for (int c = 0; c < vd->vdev_children; c++) { 4692 4693 /* 4694 * Set the vdev id to the first hole, if one exists. 4695 */ 4696 for (id = 0; id < rvd->vdev_children; id++) { 4697 if (rvd->vdev_child[id]->vdev_ishole) { 4698 vdev_free(rvd->vdev_child[id]); 4699 break; 4700 } 4701 } 4702 tvd = vd->vdev_child[c]; 4703 vdev_remove_child(vd, tvd); 4704 tvd->vdev_id = id; 4705 vdev_add_child(rvd, tvd); 4706 vdev_config_dirty(tvd); 4707 } 4708 4709 if (nspares != 0) { 4710 spa_set_aux_vdevs(&spa->spa_spares, spares, nspares, 4711 ZPOOL_CONFIG_SPARES); 4712 spa_load_spares(spa); 4713 spa->spa_spares.sav_sync = B_TRUE; 4714 } 4715 4716 if (nl2cache != 0) { 4717 spa_set_aux_vdevs(&spa->spa_l2cache, l2cache, nl2cache, 4718 ZPOOL_CONFIG_L2CACHE); 4719 spa_load_l2cache(spa); 4720 spa->spa_l2cache.sav_sync = B_TRUE; 4721 } 4722 4723 /* 4724 * We have to be careful when adding new vdevs to an existing pool. 4725 * If other threads start allocating from these vdevs before we 4726 * sync the config cache, and we lose power, then upon reboot we may 4727 * fail to open the pool because there are DVAs that the config cache 4728 * can't translate. Therefore, we first add the vdevs without 4729 * initializing metaslabs; sync the config cache (via spa_vdev_exit()); 4730 * and then let spa_config_update() initialize the new metaslabs. 4731 * 4732 * spa_load() checks for added-but-not-initialized vdevs, so that 4733 * if we lose power at any point in this sequence, the remaining 4734 * steps will be completed the next time we load the pool. 4735 */ 4736 (void) spa_vdev_exit(spa, vd, txg, 0); 4737 4738 mutex_enter(&spa_namespace_lock); 4739 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 4740 spa_event_notify(spa, NULL, ESC_ZFS_VDEV_ADD); 4741 mutex_exit(&spa_namespace_lock); 4742 4743 return (0); 4744} 4745 4746/* 4747 * Attach a device to a mirror. The arguments are the path to any device 4748 * in the mirror, and the nvroot for the new device. If the path specifies 4749 * a device that is not mirrored, we automatically insert the mirror vdev. 4750 * 4751 * If 'replacing' is specified, the new device is intended to replace the 4752 * existing device; in this case the two devices are made into their own 4753 * mirror using the 'replacing' vdev, which is functionally identical to 4754 * the mirror vdev (it actually reuses all the same ops) but has a few 4755 * extra rules: you can't attach to it after it's been created, and upon 4756 * completion of resilvering, the first disk (the one being replaced) 4757 * is automatically detached. 4758 */ 4759int 4760spa_vdev_attach(spa_t *spa, uint64_t guid, nvlist_t *nvroot, int replacing) 4761{ 4762 uint64_t txg, dtl_max_txg; 4763 vdev_t *rvd = spa->spa_root_vdev; 4764 vdev_t *oldvd, *newvd, *newrootvd, *pvd, *tvd; 4765 vdev_ops_t *pvops; 4766 char *oldvdpath, *newvdpath; 4767 int newvd_isspare; 4768 int error; 4769 4770 ASSERT(spa_writeable(spa)); 4771 4772 txg = spa_vdev_enter(spa); 4773 4774 oldvd = spa_lookup_by_guid(spa, guid, B_FALSE); 4775 4776 if (oldvd == NULL) 4777 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4778 4779 if (!oldvd->vdev_ops->vdev_op_leaf) 4780 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4781 4782 pvd = oldvd->vdev_parent; 4783 4784 if ((error = spa_config_parse(spa, &newrootvd, nvroot, NULL, 0, 4785 VDEV_ALLOC_ATTACH)) != 0) 4786 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 4787 4788 if (newrootvd->vdev_children != 1) 4789 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4790 4791 newvd = newrootvd->vdev_child[0]; 4792 4793 if (!newvd->vdev_ops->vdev_op_leaf) 4794 return (spa_vdev_exit(spa, newrootvd, txg, EINVAL)); 4795 4796 if ((error = vdev_create(newrootvd, txg, replacing)) != 0) 4797 return (spa_vdev_exit(spa, newrootvd, txg, error)); 4798 4799 /* 4800 * Spares can't replace logs 4801 */ 4802 if (oldvd->vdev_top->vdev_islog && newvd->vdev_isspare) 4803 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4804 4805 if (!replacing) { 4806 /* 4807 * For attach, the only allowable parent is a mirror or the root 4808 * vdev. 4809 */ 4810 if (pvd->vdev_ops != &vdev_mirror_ops && 4811 pvd->vdev_ops != &vdev_root_ops) 4812 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4813 4814 pvops = &vdev_mirror_ops; 4815 } else { 4816 /* 4817 * Active hot spares can only be replaced by inactive hot 4818 * spares. 4819 */ 4820 if (pvd->vdev_ops == &vdev_spare_ops && 4821 oldvd->vdev_isspare && 4822 !spa_has_spare(spa, newvd->vdev_guid)) 4823 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4824 4825 /* 4826 * If the source is a hot spare, and the parent isn't already a 4827 * spare, then we want to create a new hot spare. Otherwise, we 4828 * want to create a replacing vdev. The user is not allowed to 4829 * attach to a spared vdev child unless the 'isspare' state is 4830 * the same (spare replaces spare, non-spare replaces 4831 * non-spare). 4832 */ 4833 if (pvd->vdev_ops == &vdev_replacing_ops && 4834 spa_version(spa) < SPA_VERSION_MULTI_REPLACE) { 4835 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4836 } else if (pvd->vdev_ops == &vdev_spare_ops && 4837 newvd->vdev_isspare != oldvd->vdev_isspare) { 4838 return (spa_vdev_exit(spa, newrootvd, txg, ENOTSUP)); 4839 } 4840 4841 if (newvd->vdev_isspare) 4842 pvops = &vdev_spare_ops; 4843 else 4844 pvops = &vdev_replacing_ops; 4845 } 4846 4847 /* 4848 * Make sure the new device is big enough. 4849 */ 4850 if (newvd->vdev_asize < vdev_get_min_asize(oldvd)) 4851 return (spa_vdev_exit(spa, newrootvd, txg, EOVERFLOW)); 4852 4853 /* 4854 * The new device cannot have a higher alignment requirement 4855 * than the top-level vdev. 4856 */ 4857 if (newvd->vdev_ashift > oldvd->vdev_top->vdev_ashift) 4858 return (spa_vdev_exit(spa, newrootvd, txg, EDOM)); 4859 4860 /* 4861 * If this is an in-place replacement, update oldvd's path and devid 4862 * to make it distinguishable from newvd, and unopenable from now on. 4863 */ 4864 if (strcmp(oldvd->vdev_path, newvd->vdev_path) == 0) { 4865 spa_strfree(oldvd->vdev_path); 4866 oldvd->vdev_path = kmem_alloc(strlen(newvd->vdev_path) + 5, 4867 KM_SLEEP); 4868 (void) sprintf(oldvd->vdev_path, "%s/%s", 4869 newvd->vdev_path, "old"); 4870 if (oldvd->vdev_devid != NULL) { 4871 spa_strfree(oldvd->vdev_devid); 4872 oldvd->vdev_devid = NULL; 4873 } 4874 } 4875 4876 /* mark the device being resilvered */ 4877 newvd->vdev_resilver_txg = txg; 4878 4879 /* 4880 * If the parent is not a mirror, or if we're replacing, insert the new 4881 * mirror/replacing/spare vdev above oldvd. 4882 */ 4883 if (pvd->vdev_ops != pvops) 4884 pvd = vdev_add_parent(oldvd, pvops); 4885 4886 ASSERT(pvd->vdev_top->vdev_parent == rvd); 4887 ASSERT(pvd->vdev_ops == pvops); 4888 ASSERT(oldvd->vdev_parent == pvd); 4889 4890 /* 4891 * Extract the new device from its root and add it to pvd. 4892 */ 4893 vdev_remove_child(newrootvd, newvd); 4894 newvd->vdev_id = pvd->vdev_children; 4895 newvd->vdev_crtxg = oldvd->vdev_crtxg; 4896 vdev_add_child(pvd, newvd); 4897 4898 tvd = newvd->vdev_top; 4899 ASSERT(pvd->vdev_top == tvd); 4900 ASSERT(tvd->vdev_parent == rvd); 4901 4902 vdev_config_dirty(tvd); 4903 4904 /* 4905 * Set newvd's DTL to [TXG_INITIAL, dtl_max_txg) so that we account 4906 * for any dmu_sync-ed blocks. It will propagate upward when 4907 * spa_vdev_exit() calls vdev_dtl_reassess(). 4908 */ 4909 dtl_max_txg = txg + TXG_CONCURRENT_STATES; 4910 4911 vdev_dtl_dirty(newvd, DTL_MISSING, TXG_INITIAL, 4912 dtl_max_txg - TXG_INITIAL); 4913 4914 if (newvd->vdev_isspare) { 4915 spa_spare_activate(newvd); 4916 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_SPARE); 4917 } 4918 4919 oldvdpath = spa_strdup(oldvd->vdev_path); 4920 newvdpath = spa_strdup(newvd->vdev_path); 4921 newvd_isspare = newvd->vdev_isspare; 4922 4923 /* 4924 * Mark newvd's DTL dirty in this txg. 4925 */ 4926 vdev_dirty(tvd, VDD_DTL, newvd, txg); 4927 4928 /* 4929 * Schedule the resilver to restart in the future. We do this to 4930 * ensure that dmu_sync-ed blocks have been stitched into the 4931 * respective datasets. 4932 */ 4933 dsl_resilver_restart(spa->spa_dsl_pool, dtl_max_txg); 4934 4935 if (spa->spa_bootfs) 4936 spa_event_notify(spa, newvd, ESC_ZFS_BOOTFS_VDEV_ATTACH); 4937 4938 spa_event_notify(spa, newvd, ESC_ZFS_VDEV_ATTACH); 4939 4940 /* 4941 * Commit the config 4942 */ 4943 (void) spa_vdev_exit(spa, newrootvd, dtl_max_txg, 0); 4944 4945 spa_history_log_internal(spa, "vdev attach", NULL, 4946 "%s vdev=%s %s vdev=%s", 4947 replacing && newvd_isspare ? "spare in" : 4948 replacing ? "replace" : "attach", newvdpath, 4949 replacing ? "for" : "to", oldvdpath); 4950 4951 spa_strfree(oldvdpath); 4952 spa_strfree(newvdpath); 4953 4954 return (0); 4955} 4956 4957/* 4958 * Detach a device from a mirror or replacing vdev. 4959 * 4960 * If 'replace_done' is specified, only detach if the parent 4961 * is a replacing vdev. 4962 */ 4963int 4964spa_vdev_detach(spa_t *spa, uint64_t guid, uint64_t pguid, int replace_done) 4965{ 4966 uint64_t txg; 4967 int error; 4968 vdev_t *rvd = spa->spa_root_vdev; 4969 vdev_t *vd, *pvd, *cvd, *tvd; 4970 boolean_t unspare = B_FALSE; 4971 uint64_t unspare_guid = 0; 4972 char *vdpath; 4973 4974 ASSERT(spa_writeable(spa)); 4975 4976 txg = spa_vdev_enter(spa); 4977 4978 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 4979 4980 if (vd == NULL) 4981 return (spa_vdev_exit(spa, NULL, txg, ENODEV)); 4982 4983 if (!vd->vdev_ops->vdev_op_leaf) 4984 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 4985 4986 pvd = vd->vdev_parent; 4987 4988 /* 4989 * If the parent/child relationship is not as expected, don't do it. 4990 * Consider M(A,R(B,C)) -- that is, a mirror of A with a replacing 4991 * vdev that's replacing B with C. The user's intent in replacing 4992 * is to go from M(A,B) to M(A,C). If the user decides to cancel 4993 * the replace by detaching C, the expected behavior is to end up 4994 * M(A,B). But suppose that right after deciding to detach C, 4995 * the replacement of B completes. We would have M(A,C), and then 4996 * ask to detach C, which would leave us with just A -- not what 4997 * the user wanted. To prevent this, we make sure that the 4998 * parent/child relationship hasn't changed -- in this example, 4999 * that C's parent is still the replacing vdev R. 5000 */ 5001 if (pvd->vdev_guid != pguid && pguid != 0) 5002 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5003 5004 /* 5005 * Only 'replacing' or 'spare' vdevs can be replaced. 5006 */ 5007 if (replace_done && pvd->vdev_ops != &vdev_replacing_ops && 5008 pvd->vdev_ops != &vdev_spare_ops) 5009 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5010 5011 ASSERT(pvd->vdev_ops != &vdev_spare_ops || 5012 spa_version(spa) >= SPA_VERSION_SPARES); 5013 5014 /* 5015 * Only mirror, replacing, and spare vdevs support detach. 5016 */ 5017 if (pvd->vdev_ops != &vdev_replacing_ops && 5018 pvd->vdev_ops != &vdev_mirror_ops && 5019 pvd->vdev_ops != &vdev_spare_ops) 5020 return (spa_vdev_exit(spa, NULL, txg, ENOTSUP)); 5021 5022 /* 5023 * If this device has the only valid copy of some data, 5024 * we cannot safely detach it. 5025 */ 5026 if (vdev_dtl_required(vd)) 5027 return (spa_vdev_exit(spa, NULL, txg, EBUSY)); 5028 5029 ASSERT(pvd->vdev_children >= 2); 5030 5031 /* 5032 * If we are detaching the second disk from a replacing vdev, then 5033 * check to see if we changed the original vdev's path to have "/old" 5034 * at the end in spa_vdev_attach(). If so, undo that change now. 5035 */ 5036 if (pvd->vdev_ops == &vdev_replacing_ops && vd->vdev_id > 0 && 5037 vd->vdev_path != NULL) { 5038 size_t len = strlen(vd->vdev_path); 5039 5040 for (int c = 0; c < pvd->vdev_children; c++) { 5041 cvd = pvd->vdev_child[c]; 5042 5043 if (cvd == vd || cvd->vdev_path == NULL) 5044 continue; 5045 5046 if (strncmp(cvd->vdev_path, vd->vdev_path, len) == 0 && 5047 strcmp(cvd->vdev_path + len, "/old") == 0) { 5048 spa_strfree(cvd->vdev_path); 5049 cvd->vdev_path = spa_strdup(vd->vdev_path); 5050 break; 5051 } 5052 } 5053 } 5054 5055 /* 5056 * If we are detaching the original disk from a spare, then it implies 5057 * that the spare should become a real disk, and be removed from the 5058 * active spare list for the pool. 5059 */ 5060 if (pvd->vdev_ops == &vdev_spare_ops && 5061 vd->vdev_id == 0 && 5062 pvd->vdev_child[pvd->vdev_children - 1]->vdev_isspare) 5063 unspare = B_TRUE; 5064 5065 /* 5066 * Erase the disk labels so the disk can be used for other things. 5067 * This must be done after all other error cases are handled, 5068 * but before we disembowel vd (so we can still do I/O to it). 5069 * But if we can't do it, don't treat the error as fatal -- 5070 * it may be that the unwritability of the disk is the reason 5071 * it's being detached! 5072 */ 5073 error = vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5074 5075 /* 5076 * Remove vd from its parent and compact the parent's children. 5077 */ 5078 vdev_remove_child(pvd, vd); 5079 vdev_compact_children(pvd); 5080 5081 /* 5082 * Remember one of the remaining children so we can get tvd below. 5083 */ 5084 cvd = pvd->vdev_child[pvd->vdev_children - 1]; 5085 5086 /* 5087 * If we need to remove the remaining child from the list of hot spares, 5088 * do it now, marking the vdev as no longer a spare in the process. 5089 * We must do this before vdev_remove_parent(), because that can 5090 * change the GUID if it creates a new toplevel GUID. For a similar 5091 * reason, we must remove the spare now, in the same txg as the detach; 5092 * otherwise someone could attach a new sibling, change the GUID, and 5093 * the subsequent attempt to spa_vdev_remove(unspare_guid) would fail. 5094 */ 5095 if (unspare) { 5096 ASSERT(cvd->vdev_isspare); 5097 spa_spare_remove(cvd); 5098 unspare_guid = cvd->vdev_guid; 5099 (void) spa_vdev_remove(spa, unspare_guid, B_TRUE); 5100 cvd->vdev_unspare = B_TRUE; 5101 } 5102 5103 /* 5104 * If the parent mirror/replacing vdev only has one child, 5105 * the parent is no longer needed. Remove it from the tree. 5106 */ 5107 if (pvd->vdev_children == 1) { 5108 if (pvd->vdev_ops == &vdev_spare_ops) 5109 cvd->vdev_unspare = B_FALSE; 5110 vdev_remove_parent(cvd); 5111 } 5112 5113 5114 /* 5115 * We don't set tvd until now because the parent we just removed 5116 * may have been the previous top-level vdev. 5117 */ 5118 tvd = cvd->vdev_top; 5119 ASSERT(tvd->vdev_parent == rvd); 5120 5121 /* 5122 * Reevaluate the parent vdev state. 5123 */ 5124 vdev_propagate_state(cvd); 5125 5126 /* 5127 * If the 'autoexpand' property is set on the pool then automatically 5128 * try to expand the size of the pool. For example if the device we 5129 * just detached was smaller than the others, it may be possible to 5130 * add metaslabs (i.e. grow the pool). We need to reopen the vdev 5131 * first so that we can obtain the updated sizes of the leaf vdevs. 5132 */ 5133 if (spa->spa_autoexpand) { 5134 vdev_reopen(tvd); 5135 vdev_expand(tvd, txg); 5136 } 5137 5138 vdev_config_dirty(tvd); 5139 5140 /* 5141 * Mark vd's DTL as dirty in this txg. vdev_dtl_sync() will see that 5142 * vd->vdev_detached is set and free vd's DTL object in syncing context. 5143 * But first make sure we're not on any *other* txg's DTL list, to 5144 * prevent vd from being accessed after it's freed. 5145 */ 5146 vdpath = spa_strdup(vd->vdev_path); 5147 for (int t = 0; t < TXG_SIZE; t++) 5148 (void) txg_list_remove_this(&tvd->vdev_dtl_list, vd, t); 5149 vd->vdev_detached = B_TRUE; 5150 vdev_dirty(tvd, VDD_DTL, vd, txg); 5151 5152 spa_event_notify(spa, vd, ESC_ZFS_VDEV_REMOVE); 5153 5154 /* hang on to the spa before we release the lock */ 5155 spa_open_ref(spa, FTAG); 5156 5157 error = spa_vdev_exit(spa, vd, txg, 0); 5158 5159 spa_history_log_internal(spa, "detach", NULL, 5160 "vdev=%s", vdpath); 5161 spa_strfree(vdpath); 5162 5163 /* 5164 * If this was the removal of the original device in a hot spare vdev, 5165 * then we want to go through and remove the device from the hot spare 5166 * list of every other pool. 5167 */ 5168 if (unspare) { 5169 spa_t *altspa = NULL; 5170 5171 mutex_enter(&spa_namespace_lock); 5172 while ((altspa = spa_next(altspa)) != NULL) { 5173 if (altspa->spa_state != POOL_STATE_ACTIVE || 5174 altspa == spa) 5175 continue; 5176 5177 spa_open_ref(altspa, FTAG); 5178 mutex_exit(&spa_namespace_lock); 5179 (void) spa_vdev_remove(altspa, unspare_guid, B_TRUE); 5180 mutex_enter(&spa_namespace_lock); 5181 spa_close(altspa, FTAG); 5182 } 5183 mutex_exit(&spa_namespace_lock); 5184 5185 /* search the rest of the vdevs for spares to remove */ 5186 spa_vdev_resilver_done(spa); 5187 } 5188 5189 /* all done with the spa; OK to release */ 5190 mutex_enter(&spa_namespace_lock); 5191 spa_close(spa, FTAG); 5192 mutex_exit(&spa_namespace_lock); 5193 5194 return (error); 5195} 5196 5197/* 5198 * Split a set of devices from their mirrors, and create a new pool from them. 5199 */ 5200int 5201spa_vdev_split_mirror(spa_t *spa, char *newname, nvlist_t *config, 5202 nvlist_t *props, boolean_t exp) 5203{ 5204 int error = 0; 5205 uint64_t txg, *glist; 5206 spa_t *newspa; 5207 uint_t c, children, lastlog; 5208 nvlist_t **child, *nvl, *tmp; 5209 dmu_tx_t *tx; 5210 char *altroot = NULL; 5211 vdev_t *rvd, **vml = NULL; /* vdev modify list */ 5212 boolean_t activate_slog; 5213 5214 ASSERT(spa_writeable(spa)); 5215 5216 txg = spa_vdev_enter(spa); 5217 5218 /* clear the log and flush everything up to now */ 5219 activate_slog = spa_passivate_log(spa); 5220 (void) spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5221 error = spa_offline_log(spa); 5222 txg = spa_vdev_config_enter(spa); 5223 5224 if (activate_slog) 5225 spa_activate_log(spa); 5226 5227 if (error != 0) 5228 return (spa_vdev_exit(spa, NULL, txg, error)); 5229 5230 /* check new spa name before going any further */ 5231 if (spa_lookup(newname) != NULL) 5232 return (spa_vdev_exit(spa, NULL, txg, EEXIST)); 5233 5234 /* 5235 * scan through all the children to ensure they're all mirrors 5236 */ 5237 if (nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &nvl) != 0 || 5238 nvlist_lookup_nvlist_array(nvl, ZPOOL_CONFIG_CHILDREN, &child, 5239 &children) != 0) 5240 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5241 5242 /* first, check to ensure we've got the right child count */ 5243 rvd = spa->spa_root_vdev; 5244 lastlog = 0; 5245 for (c = 0; c < rvd->vdev_children; c++) { 5246 vdev_t *vd = rvd->vdev_child[c]; 5247 5248 /* don't count the holes & logs as children */ 5249 if (vd->vdev_islog || vd->vdev_ishole) { 5250 if (lastlog == 0) 5251 lastlog = c; 5252 continue; 5253 } 5254 5255 lastlog = 0; 5256 } 5257 if (children != (lastlog != 0 ? lastlog : rvd->vdev_children)) 5258 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5259 5260 /* next, ensure no spare or cache devices are part of the split */ 5261 if (nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_SPARES, &tmp) == 0 || 5262 nvlist_lookup_nvlist(nvl, ZPOOL_CONFIG_L2CACHE, &tmp) == 0) 5263 return (spa_vdev_exit(spa, NULL, txg, EINVAL)); 5264 5265 vml = kmem_zalloc(children * sizeof (vdev_t *), KM_SLEEP); 5266 glist = kmem_zalloc(children * sizeof (uint64_t), KM_SLEEP); 5267 5268 /* then, loop over each vdev and validate it */ 5269 for (c = 0; c < children; c++) { 5270 uint64_t is_hole = 0; 5271 5272 (void) nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_IS_HOLE, 5273 &is_hole); 5274 5275 if (is_hole != 0) { 5276 if (spa->spa_root_vdev->vdev_child[c]->vdev_ishole || 5277 spa->spa_root_vdev->vdev_child[c]->vdev_islog) { 5278 continue; 5279 } else { 5280 error = SET_ERROR(EINVAL); 5281 break; 5282 } 5283 } 5284 5285 /* which disk is going to be split? */ 5286 if (nvlist_lookup_uint64(child[c], ZPOOL_CONFIG_GUID, 5287 &glist[c]) != 0) { 5288 error = SET_ERROR(EINVAL); 5289 break; 5290 } 5291 5292 /* look it up in the spa */ 5293 vml[c] = spa_lookup_by_guid(spa, glist[c], B_FALSE); 5294 if (vml[c] == NULL) { 5295 error = SET_ERROR(ENODEV); 5296 break; 5297 } 5298 5299 /* make sure there's nothing stopping the split */ 5300 if (vml[c]->vdev_parent->vdev_ops != &vdev_mirror_ops || 5301 vml[c]->vdev_islog || 5302 vml[c]->vdev_ishole || 5303 vml[c]->vdev_isspare || 5304 vml[c]->vdev_isl2cache || 5305 !vdev_writeable(vml[c]) || 5306 vml[c]->vdev_children != 0 || 5307 vml[c]->vdev_state != VDEV_STATE_HEALTHY || 5308 c != spa->spa_root_vdev->vdev_child[c]->vdev_id) { 5309 error = SET_ERROR(EINVAL); 5310 break; 5311 } 5312 5313 if (vdev_dtl_required(vml[c])) { 5314 error = SET_ERROR(EBUSY); 5315 break; 5316 } 5317 5318 /* we need certain info from the top level */ 5319 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_ARRAY, 5320 vml[c]->vdev_top->vdev_ms_array) == 0); 5321 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_METASLAB_SHIFT, 5322 vml[c]->vdev_top->vdev_ms_shift) == 0); 5323 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASIZE, 5324 vml[c]->vdev_top->vdev_asize) == 0); 5325 VERIFY(nvlist_add_uint64(child[c], ZPOOL_CONFIG_ASHIFT, 5326 vml[c]->vdev_top->vdev_ashift) == 0); 5327 } 5328 5329 if (error != 0) { 5330 kmem_free(vml, children * sizeof (vdev_t *)); 5331 kmem_free(glist, children * sizeof (uint64_t)); 5332 return (spa_vdev_exit(spa, NULL, txg, error)); 5333 } 5334 5335 /* stop writers from using the disks */ 5336 for (c = 0; c < children; c++) { 5337 if (vml[c] != NULL) 5338 vml[c]->vdev_offline = B_TRUE; 5339 } 5340 vdev_reopen(spa->spa_root_vdev); 5341 5342 /* 5343 * Temporarily record the splitting vdevs in the spa config. This 5344 * will disappear once the config is regenerated. 5345 */ 5346 VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5347 VERIFY(nvlist_add_uint64_array(nvl, ZPOOL_CONFIG_SPLIT_LIST, 5348 glist, children) == 0); 5349 kmem_free(glist, children * sizeof (uint64_t)); 5350 5351 mutex_enter(&spa->spa_props_lock); 5352 VERIFY(nvlist_add_nvlist(spa->spa_config, ZPOOL_CONFIG_SPLIT, 5353 nvl) == 0); 5354 mutex_exit(&spa->spa_props_lock); 5355 spa->spa_config_splitting = nvl; 5356 vdev_config_dirty(spa->spa_root_vdev); 5357 5358 /* configure and create the new pool */ 5359 VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME, newname) == 0); 5360 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE, 5361 exp ? POOL_STATE_EXPORTED : POOL_STATE_ACTIVE) == 0); 5362 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 5363 spa_version(spa)) == 0); 5364 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG, 5365 spa->spa_config_txg) == 0); 5366 VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_GUID, 5367 spa_generate_guid(NULL)) == 0); 5368 (void) nvlist_lookup_string(props, 5369 zpool_prop_to_name(ZPOOL_PROP_ALTROOT), &altroot); 5370 5371 /* add the new pool to the namespace */ 5372 newspa = spa_add(newname, config, altroot); 5373 newspa->spa_config_txg = spa->spa_config_txg; 5374 spa_set_log_state(newspa, SPA_LOG_CLEAR); 5375 5376 /* release the spa config lock, retaining the namespace lock */ 5377 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5378 5379 if (zio_injection_enabled) 5380 zio_handle_panic_injection(spa, FTAG, 1); 5381 5382 spa_activate(newspa, spa_mode_global); 5383 spa_async_suspend(newspa); 5384 5385#ifndef sun 5386 /* mark that we are creating new spa by splitting */ 5387 newspa->spa_splitting_newspa = B_TRUE; 5388#endif 5389 /* create the new pool from the disks of the original pool */ 5390 error = spa_load(newspa, SPA_LOAD_IMPORT, SPA_IMPORT_ASSEMBLE, B_TRUE); 5391#ifndef sun 5392 newspa->spa_splitting_newspa = B_FALSE; 5393#endif 5394 if (error) 5395 goto out; 5396 5397 /* if that worked, generate a real config for the new pool */ 5398 if (newspa->spa_root_vdev != NULL) { 5399 VERIFY(nvlist_alloc(&newspa->spa_config_splitting, 5400 NV_UNIQUE_NAME, KM_SLEEP) == 0); 5401 VERIFY(nvlist_add_uint64(newspa->spa_config_splitting, 5402 ZPOOL_CONFIG_SPLIT_GUID, spa_guid(spa)) == 0); 5403 spa_config_set(newspa, spa_config_generate(newspa, NULL, -1ULL, 5404 B_TRUE)); 5405 } 5406 5407 /* set the props */ 5408 if (props != NULL) { 5409 spa_configfile_set(newspa, props, B_FALSE); 5410 error = spa_prop_set(newspa, props); 5411 if (error) 5412 goto out; 5413 } 5414 5415 /* flush everything */ 5416 txg = spa_vdev_config_enter(newspa); 5417 vdev_config_dirty(newspa->spa_root_vdev); 5418 (void) spa_vdev_config_exit(newspa, NULL, txg, 0, FTAG); 5419 5420 if (zio_injection_enabled) 5421 zio_handle_panic_injection(spa, FTAG, 2); 5422 5423 spa_async_resume(newspa); 5424 5425 /* finally, update the original pool's config */ 5426 txg = spa_vdev_config_enter(spa); 5427 tx = dmu_tx_create_dd(spa_get_dsl(spa)->dp_mos_dir); 5428 error = dmu_tx_assign(tx, TXG_WAIT); 5429 if (error != 0) 5430 dmu_tx_abort(tx); 5431 for (c = 0; c < children; c++) { 5432 if (vml[c] != NULL) { 5433 vdev_split(vml[c]); 5434 if (error == 0) 5435 spa_history_log_internal(spa, "detach", tx, 5436 "vdev=%s", vml[c]->vdev_path); 5437 vdev_free(vml[c]); 5438 } 5439 } 5440 vdev_config_dirty(spa->spa_root_vdev); 5441 spa->spa_config_splitting = NULL; 5442 nvlist_free(nvl); 5443 if (error == 0) 5444 dmu_tx_commit(tx); 5445 (void) spa_vdev_exit(spa, NULL, txg, 0); 5446 5447 if (zio_injection_enabled) 5448 zio_handle_panic_injection(spa, FTAG, 3); 5449 5450 /* split is complete; log a history record */ 5451 spa_history_log_internal(newspa, "split", NULL, 5452 "from pool %s", spa_name(spa)); 5453 5454 kmem_free(vml, children * sizeof (vdev_t *)); 5455 5456 /* if we're not going to mount the filesystems in userland, export */ 5457 if (exp) 5458 error = spa_export_common(newname, POOL_STATE_EXPORTED, NULL, 5459 B_FALSE, B_FALSE); 5460 5461 return (error); 5462 5463out: 5464 spa_unload(newspa); 5465 spa_deactivate(newspa); 5466 spa_remove(newspa); 5467 5468 txg = spa_vdev_config_enter(spa); 5469 5470 /* re-online all offlined disks */ 5471 for (c = 0; c < children; c++) { 5472 if (vml[c] != NULL) 5473 vml[c]->vdev_offline = B_FALSE; 5474 } 5475 vdev_reopen(spa->spa_root_vdev); 5476 5477 nvlist_free(spa->spa_config_splitting); 5478 spa->spa_config_splitting = NULL; 5479 (void) spa_vdev_exit(spa, NULL, txg, error); 5480 5481 kmem_free(vml, children * sizeof (vdev_t *)); 5482 return (error); 5483} 5484 5485static nvlist_t * 5486spa_nvlist_lookup_by_guid(nvlist_t **nvpp, int count, uint64_t target_guid) 5487{ 5488 for (int i = 0; i < count; i++) { 5489 uint64_t guid; 5490 5491 VERIFY(nvlist_lookup_uint64(nvpp[i], ZPOOL_CONFIG_GUID, 5492 &guid) == 0); 5493 5494 if (guid == target_guid) 5495 return (nvpp[i]); 5496 } 5497 5498 return (NULL); 5499} 5500 5501static void 5502spa_vdev_remove_aux(nvlist_t *config, char *name, nvlist_t **dev, int count, 5503 nvlist_t *dev_to_remove) 5504{ 5505 nvlist_t **newdev = NULL; 5506 5507 if (count > 1) 5508 newdev = kmem_alloc((count - 1) * sizeof (void *), KM_SLEEP); 5509 5510 for (int i = 0, j = 0; i < count; i++) { 5511 if (dev[i] == dev_to_remove) 5512 continue; 5513 VERIFY(nvlist_dup(dev[i], &newdev[j++], KM_SLEEP) == 0); 5514 } 5515 5516 VERIFY(nvlist_remove(config, name, DATA_TYPE_NVLIST_ARRAY) == 0); 5517 VERIFY(nvlist_add_nvlist_array(config, name, newdev, count - 1) == 0); 5518 5519 for (int i = 0; i < count - 1; i++) 5520 nvlist_free(newdev[i]); 5521 5522 if (count > 1) 5523 kmem_free(newdev, (count - 1) * sizeof (void *)); 5524} 5525 5526/* 5527 * Evacuate the device. 5528 */ 5529static int 5530spa_vdev_remove_evacuate(spa_t *spa, vdev_t *vd) 5531{ 5532 uint64_t txg; 5533 int error = 0; 5534 5535 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5536 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5537 ASSERT(vd == vd->vdev_top); 5538 5539 /* 5540 * Evacuate the device. We don't hold the config lock as writer 5541 * since we need to do I/O but we do keep the 5542 * spa_namespace_lock held. Once this completes the device 5543 * should no longer have any blocks allocated on it. 5544 */ 5545 if (vd->vdev_islog) { 5546 if (vd->vdev_stat.vs_alloc != 0) 5547 error = spa_offline_log(spa); 5548 } else { 5549 error = SET_ERROR(ENOTSUP); 5550 } 5551 5552 if (error) 5553 return (error); 5554 5555 /* 5556 * The evacuation succeeded. Remove any remaining MOS metadata 5557 * associated with this vdev, and wait for these changes to sync. 5558 */ 5559 ASSERT0(vd->vdev_stat.vs_alloc); 5560 txg = spa_vdev_config_enter(spa); 5561 vd->vdev_removing = B_TRUE; 5562 vdev_dirty_leaves(vd, VDD_DTL, txg); 5563 vdev_config_dirty(vd); 5564 spa_vdev_config_exit(spa, NULL, txg, 0, FTAG); 5565 5566 return (0); 5567} 5568 5569/* 5570 * Complete the removal by cleaning up the namespace. 5571 */ 5572static void 5573spa_vdev_remove_from_namespace(spa_t *spa, vdev_t *vd) 5574{ 5575 vdev_t *rvd = spa->spa_root_vdev; 5576 uint64_t id = vd->vdev_id; 5577 boolean_t last_vdev = (id == (rvd->vdev_children - 1)); 5578 5579 ASSERT(MUTEX_HELD(&spa_namespace_lock)); 5580 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 5581 ASSERT(vd == vd->vdev_top); 5582 5583 /* 5584 * Only remove any devices which are empty. 5585 */ 5586 if (vd->vdev_stat.vs_alloc != 0) 5587 return; 5588 5589 (void) vdev_label_init(vd, 0, VDEV_LABEL_REMOVE); 5590 5591 if (list_link_active(&vd->vdev_state_dirty_node)) 5592 vdev_state_clean(vd); 5593 if (list_link_active(&vd->vdev_config_dirty_node)) 5594 vdev_config_clean(vd); 5595 5596 vdev_free(vd); 5597 5598 if (last_vdev) { 5599 vdev_compact_children(rvd); 5600 } else { 5601 vd = vdev_alloc_common(spa, id, 0, &vdev_hole_ops); 5602 vdev_add_child(rvd, vd); 5603 } 5604 vdev_config_dirty(rvd); 5605 5606 /* 5607 * Reassess the health of our root vdev. 5608 */ 5609 vdev_reopen(rvd); 5610} 5611 5612/* 5613 * Remove a device from the pool - 5614 * 5615 * Removing a device from the vdev namespace requires several steps 5616 * and can take a significant amount of time. As a result we use 5617 * the spa_vdev_config_[enter/exit] functions which allow us to 5618 * grab and release the spa_config_lock while still holding the namespace 5619 * lock. During each step the configuration is synced out. 5620 * 5621 * Currently, this supports removing only hot spares, slogs, and level 2 ARC 5622 * devices. 5623 */ 5624int 5625spa_vdev_remove(spa_t *spa, uint64_t guid, boolean_t unspare) 5626{ 5627 vdev_t *vd; 5628 metaslab_group_t *mg; 5629 nvlist_t **spares, **l2cache, *nv; 5630 uint64_t txg = 0; 5631 uint_t nspares, nl2cache; 5632 int error = 0; 5633 boolean_t locked = MUTEX_HELD(&spa_namespace_lock); 5634 5635 ASSERT(spa_writeable(spa)); 5636 5637 if (!locked) 5638 txg = spa_vdev_enter(spa); 5639 5640 vd = spa_lookup_by_guid(spa, guid, B_FALSE); 5641 5642 if (spa->spa_spares.sav_vdevs != NULL && 5643 nvlist_lookup_nvlist_array(spa->spa_spares.sav_config, 5644 ZPOOL_CONFIG_SPARES, &spares, &nspares) == 0 && 5645 (nv = spa_nvlist_lookup_by_guid(spares, nspares, guid)) != NULL) { 5646 /* 5647 * Only remove the hot spare if it's not currently in use 5648 * in this pool. 5649 */ 5650 if (vd == NULL || unspare) { 5651 spa_vdev_remove_aux(spa->spa_spares.sav_config, 5652 ZPOOL_CONFIG_SPARES, spares, nspares, nv); 5653 spa_load_spares(spa); 5654 spa->spa_spares.sav_sync = B_TRUE; 5655 } else { 5656 error = SET_ERROR(EBUSY); 5657 } 5658 } else if (spa->spa_l2cache.sav_vdevs != NULL && 5659 nvlist_lookup_nvlist_array(spa->spa_l2cache.sav_config, 5660 ZPOOL_CONFIG_L2CACHE, &l2cache, &nl2cache) == 0 && 5661 (nv = spa_nvlist_lookup_by_guid(l2cache, nl2cache, guid)) != NULL) { 5662 /* 5663 * Cache devices can always be removed. 5664 */ 5665 spa_vdev_remove_aux(spa->spa_l2cache.sav_config, 5666 ZPOOL_CONFIG_L2CACHE, l2cache, nl2cache, nv); 5667 spa_load_l2cache(spa); 5668 spa->spa_l2cache.sav_sync = B_TRUE; 5669 } else if (vd != NULL && vd->vdev_islog) { 5670 ASSERT(!locked); 5671 ASSERT(vd == vd->vdev_top); 5672 5673 mg = vd->vdev_mg; 5674 5675 /* 5676 * Stop allocating from this vdev. 5677 */ 5678 metaslab_group_passivate(mg); 5679 5680 /* 5681 * Wait for the youngest allocations and frees to sync, 5682 * and then wait for the deferral of those frees to finish. 5683 */ 5684 spa_vdev_config_exit(spa, NULL, 5685 txg + TXG_CONCURRENT_STATES + TXG_DEFER_SIZE, 0, FTAG); 5686 5687 /* 5688 * Attempt to evacuate the vdev. 5689 */ 5690 error = spa_vdev_remove_evacuate(spa, vd); 5691 5692 txg = spa_vdev_config_enter(spa); 5693 5694 /* 5695 * If we couldn't evacuate the vdev, unwind. 5696 */ 5697 if (error) { 5698 metaslab_group_activate(mg); 5699 return (spa_vdev_exit(spa, NULL, txg, error)); 5700 } 5701 5702 /* 5703 * Clean up the vdev namespace. 5704 */ 5705 spa_vdev_remove_from_namespace(spa, vd); 5706 5707 } else if (vd != NULL) { 5708 /* 5709 * Normal vdevs cannot be removed (yet). 5710 */ 5711 error = SET_ERROR(ENOTSUP); 5712 } else { 5713 /* 5714 * There is no vdev of any kind with the specified guid. 5715 */ 5716 error = SET_ERROR(ENOENT); 5717 } 5718 5719 if (!locked) 5720 return (spa_vdev_exit(spa, NULL, txg, error)); 5721 5722 return (error); 5723} 5724 5725/* 5726 * Find any device that's done replacing, or a vdev marked 'unspare' that's 5727 * currently spared, so we can detach it. 5728 */ 5729static vdev_t * 5730spa_vdev_resilver_done_hunt(vdev_t *vd) 5731{ 5732 vdev_t *newvd, *oldvd; 5733 5734 for (int c = 0; c < vd->vdev_children; c++) { 5735 oldvd = spa_vdev_resilver_done_hunt(vd->vdev_child[c]); 5736 if (oldvd != NULL) 5737 return (oldvd); 5738 } 5739 5740 /* 5741 * Check for a completed replacement. We always consider the first 5742 * vdev in the list to be the oldest vdev, and the last one to be 5743 * the newest (see spa_vdev_attach() for how that works). In 5744 * the case where the newest vdev is faulted, we will not automatically 5745 * remove it after a resilver completes. This is OK as it will require 5746 * user intervention to determine which disk the admin wishes to keep. 5747 */ 5748 if (vd->vdev_ops == &vdev_replacing_ops) { 5749 ASSERT(vd->vdev_children > 1); 5750 5751 newvd = vd->vdev_child[vd->vdev_children - 1]; 5752 oldvd = vd->vdev_child[0]; 5753 5754 if (vdev_dtl_empty(newvd, DTL_MISSING) && 5755 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5756 !vdev_dtl_required(oldvd)) 5757 return (oldvd); 5758 } 5759 5760 /* 5761 * Check for a completed resilver with the 'unspare' flag set. 5762 */ 5763 if (vd->vdev_ops == &vdev_spare_ops) { 5764 vdev_t *first = vd->vdev_child[0]; 5765 vdev_t *last = vd->vdev_child[vd->vdev_children - 1]; 5766 5767 if (last->vdev_unspare) { 5768 oldvd = first; 5769 newvd = last; 5770 } else if (first->vdev_unspare) { 5771 oldvd = last; 5772 newvd = first; 5773 } else { 5774 oldvd = NULL; 5775 } 5776 5777 if (oldvd != NULL && 5778 vdev_dtl_empty(newvd, DTL_MISSING) && 5779 vdev_dtl_empty(newvd, DTL_OUTAGE) && 5780 !vdev_dtl_required(oldvd)) 5781 return (oldvd); 5782 5783 /* 5784 * If there are more than two spares attached to a disk, 5785 * and those spares are not required, then we want to 5786 * attempt to free them up now so that they can be used 5787 * by other pools. Once we're back down to a single 5788 * disk+spare, we stop removing them. 5789 */ 5790 if (vd->vdev_children > 2) { 5791 newvd = vd->vdev_child[1]; 5792 5793 if (newvd->vdev_isspare && last->vdev_isspare && 5794 vdev_dtl_empty(last, DTL_MISSING) && 5795 vdev_dtl_empty(last, DTL_OUTAGE) && 5796 !vdev_dtl_required(newvd)) 5797 return (newvd); 5798 } 5799 } 5800 5801 return (NULL); 5802} 5803 5804static void 5805spa_vdev_resilver_done(spa_t *spa) 5806{ 5807 vdev_t *vd, *pvd, *ppvd; 5808 uint64_t guid, sguid, pguid, ppguid; 5809 5810 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5811 5812 while ((vd = spa_vdev_resilver_done_hunt(spa->spa_root_vdev)) != NULL) { 5813 pvd = vd->vdev_parent; 5814 ppvd = pvd->vdev_parent; 5815 guid = vd->vdev_guid; 5816 pguid = pvd->vdev_guid; 5817 ppguid = ppvd->vdev_guid; 5818 sguid = 0; 5819 /* 5820 * If we have just finished replacing a hot spared device, then 5821 * we need to detach the parent's first child (the original hot 5822 * spare) as well. 5823 */ 5824 if (ppvd->vdev_ops == &vdev_spare_ops && pvd->vdev_id == 0 && 5825 ppvd->vdev_children == 2) { 5826 ASSERT(pvd->vdev_ops == &vdev_replacing_ops); 5827 sguid = ppvd->vdev_child[1]->vdev_guid; 5828 } 5829 ASSERT(vd->vdev_resilver_txg == 0 || !vdev_dtl_required(vd)); 5830 5831 spa_config_exit(spa, SCL_ALL, FTAG); 5832 if (spa_vdev_detach(spa, guid, pguid, B_TRUE) != 0) 5833 return; 5834 if (sguid && spa_vdev_detach(spa, sguid, ppguid, B_TRUE) != 0) 5835 return; 5836 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 5837 } 5838 5839 spa_config_exit(spa, SCL_ALL, FTAG); 5840} 5841 5842/* 5843 * Update the stored path or FRU for this vdev. 5844 */ 5845int 5846spa_vdev_set_common(spa_t *spa, uint64_t guid, const char *value, 5847 boolean_t ispath) 5848{ 5849 vdev_t *vd; 5850 boolean_t sync = B_FALSE; 5851 5852 ASSERT(spa_writeable(spa)); 5853 5854 spa_vdev_state_enter(spa, SCL_ALL); 5855 5856 if ((vd = spa_lookup_by_guid(spa, guid, B_TRUE)) == NULL) 5857 return (spa_vdev_state_exit(spa, NULL, ENOENT)); 5858 5859 if (!vd->vdev_ops->vdev_op_leaf) 5860 return (spa_vdev_state_exit(spa, NULL, ENOTSUP)); 5861 5862 if (ispath) { 5863 if (strcmp(value, vd->vdev_path) != 0) { 5864 spa_strfree(vd->vdev_path); 5865 vd->vdev_path = spa_strdup(value); 5866 sync = B_TRUE; 5867 } 5868 } else { 5869 if (vd->vdev_fru == NULL) { 5870 vd->vdev_fru = spa_strdup(value); 5871 sync = B_TRUE; 5872 } else if (strcmp(value, vd->vdev_fru) != 0) { 5873 spa_strfree(vd->vdev_fru); 5874 vd->vdev_fru = spa_strdup(value); 5875 sync = B_TRUE; 5876 } 5877 } 5878 5879 return (spa_vdev_state_exit(spa, sync ? vd : NULL, 0)); 5880} 5881 5882int 5883spa_vdev_setpath(spa_t *spa, uint64_t guid, const char *newpath) 5884{ 5885 return (spa_vdev_set_common(spa, guid, newpath, B_TRUE)); 5886} 5887 5888int 5889spa_vdev_setfru(spa_t *spa, uint64_t guid, const char *newfru) 5890{ 5891 return (spa_vdev_set_common(spa, guid, newfru, B_FALSE)); 5892} 5893 5894/* 5895 * ========================================================================== 5896 * SPA Scanning 5897 * ========================================================================== 5898 */ 5899 5900int 5901spa_scan_stop(spa_t *spa) 5902{ 5903 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5904 if (dsl_scan_resilvering(spa->spa_dsl_pool)) 5905 return (SET_ERROR(EBUSY)); 5906 return (dsl_scan_cancel(spa->spa_dsl_pool)); 5907} 5908 5909int 5910spa_scan(spa_t *spa, pool_scan_func_t func) 5911{ 5912 ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == 0); 5913 5914 if (func >= POOL_SCAN_FUNCS || func == POOL_SCAN_NONE) 5915 return (SET_ERROR(ENOTSUP)); 5916 5917 /* 5918 * If a resilver was requested, but there is no DTL on a 5919 * writeable leaf device, we have nothing to do. 5920 */ 5921 if (func == POOL_SCAN_RESILVER && 5922 !vdev_resilver_needed(spa->spa_root_vdev, NULL, NULL)) { 5923 spa_async_request(spa, SPA_ASYNC_RESILVER_DONE); 5924 return (0); 5925 } 5926 5927 return (dsl_scan(spa->spa_dsl_pool, func)); 5928} 5929 5930/* 5931 * ========================================================================== 5932 * SPA async task processing 5933 * ========================================================================== 5934 */ 5935 5936static void 5937spa_async_remove(spa_t *spa, vdev_t *vd) 5938{ 5939 if (vd->vdev_remove_wanted) { 5940 vd->vdev_remove_wanted = B_FALSE; 5941 vd->vdev_delayed_close = B_FALSE; 5942 vdev_set_state(vd, B_FALSE, VDEV_STATE_REMOVED, VDEV_AUX_NONE); 5943 5944 /* 5945 * We want to clear the stats, but we don't want to do a full 5946 * vdev_clear() as that will cause us to throw away 5947 * degraded/faulted state as well as attempt to reopen the 5948 * device, all of which is a waste. 5949 */ 5950 vd->vdev_stat.vs_read_errors = 0; 5951 vd->vdev_stat.vs_write_errors = 0; 5952 vd->vdev_stat.vs_checksum_errors = 0; 5953 5954 vdev_state_dirty(vd->vdev_top); 5955 } 5956 5957 for (int c = 0; c < vd->vdev_children; c++) 5958 spa_async_remove(spa, vd->vdev_child[c]); 5959} 5960 5961static void 5962spa_async_probe(spa_t *spa, vdev_t *vd) 5963{ 5964 if (vd->vdev_probe_wanted) { 5965 vd->vdev_probe_wanted = B_FALSE; 5966 vdev_reopen(vd); /* vdev_open() does the actual probe */ 5967 } 5968 5969 for (int c = 0; c < vd->vdev_children; c++) 5970 spa_async_probe(spa, vd->vdev_child[c]); 5971} 5972 5973static void 5974spa_async_autoexpand(spa_t *spa, vdev_t *vd) 5975{ 5976 sysevent_id_t eid; 5977 nvlist_t *attr; 5978 char *physpath; 5979 5980 if (!spa->spa_autoexpand) 5981 return; 5982 5983 for (int c = 0; c < vd->vdev_children; c++) { 5984 vdev_t *cvd = vd->vdev_child[c]; 5985 spa_async_autoexpand(spa, cvd); 5986 } 5987 5988 if (!vd->vdev_ops->vdev_op_leaf || vd->vdev_physpath == NULL) 5989 return; 5990 5991 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 5992 (void) snprintf(physpath, MAXPATHLEN, "/devices%s", vd->vdev_physpath); 5993 5994 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 5995 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 5996 5997 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 5998 ESC_ZFS_VDEV_AUTOEXPAND, attr, &eid, DDI_SLEEP); 5999 6000 nvlist_free(attr); 6001 kmem_free(physpath, MAXPATHLEN); 6002} 6003 6004static void 6005spa_async_thread(void *arg) 6006{ 6007 spa_t *spa = arg; 6008 int tasks; 6009 6010 ASSERT(spa->spa_sync_on); 6011 6012 mutex_enter(&spa->spa_async_lock); 6013 tasks = spa->spa_async_tasks; 6014 spa->spa_async_tasks &= SPA_ASYNC_REMOVE; 6015 mutex_exit(&spa->spa_async_lock); 6016 6017 /* 6018 * See if the config needs to be updated. 6019 */ 6020 if (tasks & SPA_ASYNC_CONFIG_UPDATE) { 6021 uint64_t old_space, new_space; 6022 6023 mutex_enter(&spa_namespace_lock); 6024 old_space = metaslab_class_get_space(spa_normal_class(spa)); 6025 spa_config_update(spa, SPA_CONFIG_UPDATE_POOL); 6026 new_space = metaslab_class_get_space(spa_normal_class(spa)); 6027 mutex_exit(&spa_namespace_lock); 6028 6029 /* 6030 * If the pool grew as a result of the config update, 6031 * then log an internal history event. 6032 */ 6033 if (new_space != old_space) { 6034 spa_history_log_internal(spa, "vdev online", NULL, 6035 "pool '%s' size: %llu(+%llu)", 6036 spa_name(spa), new_space, new_space - old_space); 6037 } 6038 } 6039 6040 if ((tasks & SPA_ASYNC_AUTOEXPAND) && !spa_suspended(spa)) { 6041 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6042 spa_async_autoexpand(spa, spa->spa_root_vdev); 6043 spa_config_exit(spa, SCL_CONFIG, FTAG); 6044 } 6045 6046 /* 6047 * See if any devices need to be probed. 6048 */ 6049 if (tasks & SPA_ASYNC_PROBE) { 6050 spa_vdev_state_enter(spa, SCL_NONE); 6051 spa_async_probe(spa, spa->spa_root_vdev); 6052 (void) spa_vdev_state_exit(spa, NULL, 0); 6053 } 6054 6055 /* 6056 * If any devices are done replacing, detach them. 6057 */ 6058 if (tasks & SPA_ASYNC_RESILVER_DONE) 6059 spa_vdev_resilver_done(spa); 6060 6061 /* 6062 * Kick off a resilver. 6063 */ 6064 if (tasks & SPA_ASYNC_RESILVER) 6065 dsl_resilver_restart(spa->spa_dsl_pool, 0); 6066 6067 /* 6068 * Let the world know that we're done. 6069 */ 6070 mutex_enter(&spa->spa_async_lock); 6071 spa->spa_async_thread = NULL; 6072 cv_broadcast(&spa->spa_async_cv); 6073 mutex_exit(&spa->spa_async_lock); 6074 thread_exit(); 6075} 6076 6077static void 6078spa_async_thread_vd(void *arg) 6079{ 6080 spa_t *spa = arg; 6081 int tasks; 6082 6083 ASSERT(spa->spa_sync_on); 6084 6085 mutex_enter(&spa->spa_async_lock); 6086 tasks = spa->spa_async_tasks; 6087retry: 6088 spa->spa_async_tasks &= ~SPA_ASYNC_REMOVE; 6089 mutex_exit(&spa->spa_async_lock); 6090 6091 /* 6092 * See if any devices need to be marked REMOVED. 6093 */ 6094 if (tasks & SPA_ASYNC_REMOVE) { 6095 spa_vdev_state_enter(spa, SCL_NONE); 6096 spa_async_remove(spa, spa->spa_root_vdev); 6097 for (int i = 0; i < spa->spa_l2cache.sav_count; i++) 6098 spa_async_remove(spa, spa->spa_l2cache.sav_vdevs[i]); 6099 for (int i = 0; i < spa->spa_spares.sav_count; i++) 6100 spa_async_remove(spa, spa->spa_spares.sav_vdevs[i]); 6101 (void) spa_vdev_state_exit(spa, NULL, 0); 6102 } 6103 6104 /* 6105 * Let the world know that we're done. 6106 */ 6107 mutex_enter(&spa->spa_async_lock); 6108 tasks = spa->spa_async_tasks; 6109 if ((tasks & SPA_ASYNC_REMOVE) != 0) 6110 goto retry; 6111 spa->spa_async_thread_vd = NULL; 6112 cv_broadcast(&spa->spa_async_cv); 6113 mutex_exit(&spa->spa_async_lock); 6114 thread_exit(); 6115} 6116 6117void 6118spa_async_suspend(spa_t *spa) 6119{ 6120 mutex_enter(&spa->spa_async_lock); 6121 spa->spa_async_suspended++; 6122 while (spa->spa_async_thread != NULL && 6123 spa->spa_async_thread_vd != NULL) 6124 cv_wait(&spa->spa_async_cv, &spa->spa_async_lock); 6125 mutex_exit(&spa->spa_async_lock); 6126} 6127 6128void 6129spa_async_resume(spa_t *spa) 6130{ 6131 mutex_enter(&spa->spa_async_lock); 6132 ASSERT(spa->spa_async_suspended != 0); 6133 spa->spa_async_suspended--; 6134 mutex_exit(&spa->spa_async_lock); 6135} 6136 6137static boolean_t 6138spa_async_tasks_pending(spa_t *spa) 6139{ 6140 uint_t non_config_tasks; 6141 uint_t config_task; 6142 boolean_t config_task_suspended; 6143 6144 non_config_tasks = spa->spa_async_tasks & ~(SPA_ASYNC_CONFIG_UPDATE | 6145 SPA_ASYNC_REMOVE); 6146 config_task = spa->spa_async_tasks & SPA_ASYNC_CONFIG_UPDATE; 6147 if (spa->spa_ccw_fail_time == 0) { 6148 config_task_suspended = B_FALSE; 6149 } else { 6150 config_task_suspended = 6151 (gethrtime() - spa->spa_ccw_fail_time) < 6152 (zfs_ccw_retry_interval * NANOSEC); 6153 } 6154 6155 return (non_config_tasks || (config_task && !config_task_suspended)); 6156} 6157 6158static void 6159spa_async_dispatch(spa_t *spa) 6160{ 6161 mutex_enter(&spa->spa_async_lock); 6162 if (spa_async_tasks_pending(spa) && 6163 !spa->spa_async_suspended && 6164 spa->spa_async_thread == NULL && 6165 rootdir != NULL) 6166 spa->spa_async_thread = thread_create(NULL, 0, 6167 spa_async_thread, spa, 0, &p0, TS_RUN, maxclsyspri); 6168 mutex_exit(&spa->spa_async_lock); 6169} 6170 6171static void 6172spa_async_dispatch_vd(spa_t *spa) 6173{ 6174 mutex_enter(&spa->spa_async_lock); 6175 if ((spa->spa_async_tasks & SPA_ASYNC_REMOVE) != 0 && 6176 !spa->spa_async_suspended && 6177 spa->spa_async_thread_vd == NULL && 6178 rootdir != NULL) 6179 spa->spa_async_thread_vd = thread_create(NULL, 0, 6180 spa_async_thread_vd, spa, 0, &p0, TS_RUN, maxclsyspri); 6181 mutex_exit(&spa->spa_async_lock); 6182} 6183 6184void 6185spa_async_request(spa_t *spa, int task) 6186{ 6187 zfs_dbgmsg("spa=%s async request task=%u", spa->spa_name, task); 6188 mutex_enter(&spa->spa_async_lock); 6189 spa->spa_async_tasks |= task; 6190 mutex_exit(&spa->spa_async_lock); 6191 spa_async_dispatch_vd(spa); 6192} 6193 6194/* 6195 * ========================================================================== 6196 * SPA syncing routines 6197 * ========================================================================== 6198 */ 6199 6200static int 6201bpobj_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6202{ 6203 bpobj_t *bpo = arg; 6204 bpobj_enqueue(bpo, bp, tx); 6205 return (0); 6206} 6207 6208static int 6209spa_free_sync_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 6210{ 6211 zio_t *zio = arg; 6212 6213 zio_nowait(zio_free_sync(zio, zio->io_spa, dmu_tx_get_txg(tx), bp, 6214 BP_GET_PSIZE(bp), zio->io_flags)); 6215 return (0); 6216} 6217 6218/* 6219 * Note: this simple function is not inlined to make it easier to dtrace the 6220 * amount of time spent syncing frees. 6221 */ 6222static void 6223spa_sync_frees(spa_t *spa, bplist_t *bpl, dmu_tx_t *tx) 6224{ 6225 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6226 bplist_iterate(bpl, spa_free_sync_cb, zio, tx); 6227 VERIFY(zio_wait(zio) == 0); 6228} 6229 6230/* 6231 * Note: this simple function is not inlined to make it easier to dtrace the 6232 * amount of time spent syncing deferred frees. 6233 */ 6234static void 6235spa_sync_deferred_frees(spa_t *spa, dmu_tx_t *tx) 6236{ 6237 zio_t *zio = zio_root(spa, NULL, NULL, 0); 6238 VERIFY3U(bpobj_iterate(&spa->spa_deferred_bpobj, 6239 spa_free_sync_cb, zio, tx), ==, 0); 6240 VERIFY0(zio_wait(zio)); 6241} 6242 6243 6244static void 6245spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx) 6246{ 6247 char *packed = NULL; 6248 size_t bufsize; 6249 size_t nvsize = 0; 6250 dmu_buf_t *db; 6251 6252 VERIFY(nvlist_size(nv, &nvsize, NV_ENCODE_XDR) == 0); 6253 6254 /* 6255 * Write full (SPA_CONFIG_BLOCKSIZE) blocks of configuration 6256 * information. This avoids the dmu_buf_will_dirty() path and 6257 * saves us a pre-read to get data we don't actually care about. 6258 */ 6259 bufsize = P2ROUNDUP((uint64_t)nvsize, SPA_CONFIG_BLOCKSIZE); 6260 packed = kmem_alloc(bufsize, KM_SLEEP); 6261 6262 VERIFY(nvlist_pack(nv, &packed, &nvsize, NV_ENCODE_XDR, 6263 KM_SLEEP) == 0); 6264 bzero(packed + nvsize, bufsize - nvsize); 6265 6266 dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx); 6267 6268 kmem_free(packed, bufsize); 6269 6270 VERIFY(0 == dmu_bonus_hold(spa->spa_meta_objset, obj, FTAG, &db)); 6271 dmu_buf_will_dirty(db, tx); 6272 *(uint64_t *)db->db_data = nvsize; 6273 dmu_buf_rele(db, FTAG); 6274} 6275 6276static void 6277spa_sync_aux_dev(spa_t *spa, spa_aux_vdev_t *sav, dmu_tx_t *tx, 6278 const char *config, const char *entry) 6279{ 6280 nvlist_t *nvroot; 6281 nvlist_t **list; 6282 int i; 6283 6284 if (!sav->sav_sync) 6285 return; 6286 6287 /* 6288 * Update the MOS nvlist describing the list of available devices. 6289 * spa_validate_aux() will have already made sure this nvlist is 6290 * valid and the vdevs are labeled appropriately. 6291 */ 6292 if (sav->sav_object == 0) { 6293 sav->sav_object = dmu_object_alloc(spa->spa_meta_objset, 6294 DMU_OT_PACKED_NVLIST, 1 << 14, DMU_OT_PACKED_NVLIST_SIZE, 6295 sizeof (uint64_t), tx); 6296 VERIFY(zap_update(spa->spa_meta_objset, 6297 DMU_POOL_DIRECTORY_OBJECT, entry, sizeof (uint64_t), 1, 6298 &sav->sav_object, tx) == 0); 6299 } 6300 6301 VERIFY(nvlist_alloc(&nvroot, NV_UNIQUE_NAME, KM_SLEEP) == 0); 6302 if (sav->sav_count == 0) { 6303 VERIFY(nvlist_add_nvlist_array(nvroot, config, NULL, 0) == 0); 6304 } else { 6305 list = kmem_alloc(sav->sav_count * sizeof (void *), KM_SLEEP); 6306 for (i = 0; i < sav->sav_count; i++) 6307 list[i] = vdev_config_generate(spa, sav->sav_vdevs[i], 6308 B_FALSE, VDEV_CONFIG_L2CACHE); 6309 VERIFY(nvlist_add_nvlist_array(nvroot, config, list, 6310 sav->sav_count) == 0); 6311 for (i = 0; i < sav->sav_count; i++) 6312 nvlist_free(list[i]); 6313 kmem_free(list, sav->sav_count * sizeof (void *)); 6314 } 6315 6316 spa_sync_nvlist(spa, sav->sav_object, nvroot, tx); 6317 nvlist_free(nvroot); 6318 6319 sav->sav_sync = B_FALSE; 6320} 6321 6322static void 6323spa_sync_config_object(spa_t *spa, dmu_tx_t *tx) 6324{ 6325 nvlist_t *config; 6326 6327 if (list_is_empty(&spa->spa_config_dirty_list)) 6328 return; 6329 6330 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6331 6332 config = spa_config_generate(spa, spa->spa_root_vdev, 6333 dmu_tx_get_txg(tx), B_FALSE); 6334 6335 /* 6336 * If we're upgrading the spa version then make sure that 6337 * the config object gets updated with the correct version. 6338 */ 6339 if (spa->spa_ubsync.ub_version < spa->spa_uberblock.ub_version) 6340 fnvlist_add_uint64(config, ZPOOL_CONFIG_VERSION, 6341 spa->spa_uberblock.ub_version); 6342 6343 spa_config_exit(spa, SCL_STATE, FTAG); 6344 6345 if (spa->spa_config_syncing) 6346 nvlist_free(spa->spa_config_syncing); 6347 spa->spa_config_syncing = config; 6348 6349 spa_sync_nvlist(spa, spa->spa_config_object, config, tx); 6350} 6351 6352static void 6353spa_sync_version(void *arg, dmu_tx_t *tx) 6354{ 6355 uint64_t *versionp = arg; 6356 uint64_t version = *versionp; 6357 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6358 6359 /* 6360 * Setting the version is special cased when first creating the pool. 6361 */ 6362 ASSERT(tx->tx_txg != TXG_INITIAL); 6363 6364 ASSERT(SPA_VERSION_IS_SUPPORTED(version)); 6365 ASSERT(version >= spa_version(spa)); 6366 6367 spa->spa_uberblock.ub_version = version; 6368 vdev_config_dirty(spa->spa_root_vdev); 6369 spa_history_log_internal(spa, "set", tx, "version=%lld", version); 6370} 6371 6372/* 6373 * Set zpool properties. 6374 */ 6375static void 6376spa_sync_props(void *arg, dmu_tx_t *tx) 6377{ 6378 nvlist_t *nvp = arg; 6379 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 6380 objset_t *mos = spa->spa_meta_objset; 6381 nvpair_t *elem = NULL; 6382 6383 mutex_enter(&spa->spa_props_lock); 6384 6385 while ((elem = nvlist_next_nvpair(nvp, elem))) { 6386 uint64_t intval; 6387 char *strval, *fname; 6388 zpool_prop_t prop; 6389 const char *propname; 6390 zprop_type_t proptype; 6391 spa_feature_t fid; 6392 6393 switch (prop = zpool_name_to_prop(nvpair_name(elem))) { 6394 case ZPROP_INVAL: 6395 /* 6396 * We checked this earlier in spa_prop_validate(). 6397 */ 6398 ASSERT(zpool_prop_feature(nvpair_name(elem))); 6399 6400 fname = strchr(nvpair_name(elem), '@') + 1; 6401 VERIFY0(zfeature_lookup_name(fname, &fid)); 6402 6403 spa_feature_enable(spa, fid, tx); 6404 spa_history_log_internal(spa, "set", tx, 6405 "%s=enabled", nvpair_name(elem)); 6406 break; 6407 6408 case ZPOOL_PROP_VERSION: 6409 intval = fnvpair_value_uint64(elem); 6410 /* 6411 * The version is synced seperatly before other 6412 * properties and should be correct by now. 6413 */ 6414 ASSERT3U(spa_version(spa), >=, intval); 6415 break; 6416 6417 case ZPOOL_PROP_ALTROOT: 6418 /* 6419 * 'altroot' is a non-persistent property. It should 6420 * have been set temporarily at creation or import time. 6421 */ 6422 ASSERT(spa->spa_root != NULL); 6423 break; 6424 6425 case ZPOOL_PROP_READONLY: 6426 case ZPOOL_PROP_CACHEFILE: 6427 /* 6428 * 'readonly' and 'cachefile' are also non-persisitent 6429 * properties. 6430 */ 6431 break; 6432 case ZPOOL_PROP_COMMENT: 6433 strval = fnvpair_value_string(elem); 6434 if (spa->spa_comment != NULL) 6435 spa_strfree(spa->spa_comment); 6436 spa->spa_comment = spa_strdup(strval); 6437 /* 6438 * We need to dirty the configuration on all the vdevs 6439 * so that their labels get updated. It's unnecessary 6440 * to do this for pool creation since the vdev's 6441 * configuratoin has already been dirtied. 6442 */ 6443 if (tx->tx_txg != TXG_INITIAL) 6444 vdev_config_dirty(spa->spa_root_vdev); 6445 spa_history_log_internal(spa, "set", tx, 6446 "%s=%s", nvpair_name(elem), strval); 6447 break; 6448 default: 6449 /* 6450 * Set pool property values in the poolprops mos object. 6451 */ 6452 if (spa->spa_pool_props_object == 0) { 6453 spa->spa_pool_props_object = 6454 zap_create_link(mos, DMU_OT_POOL_PROPS, 6455 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_PROPS, 6456 tx); 6457 } 6458 6459 /* normalize the property name */ 6460 propname = zpool_prop_to_name(prop); 6461 proptype = zpool_prop_get_type(prop); 6462 6463 if (nvpair_type(elem) == DATA_TYPE_STRING) { 6464 ASSERT(proptype == PROP_TYPE_STRING); 6465 strval = fnvpair_value_string(elem); 6466 VERIFY0(zap_update(mos, 6467 spa->spa_pool_props_object, propname, 6468 1, strlen(strval) + 1, strval, tx)); 6469 spa_history_log_internal(spa, "set", tx, 6470 "%s=%s", nvpair_name(elem), strval); 6471 } else if (nvpair_type(elem) == DATA_TYPE_UINT64) { 6472 intval = fnvpair_value_uint64(elem); 6473 6474 if (proptype == PROP_TYPE_INDEX) { 6475 const char *unused; 6476 VERIFY0(zpool_prop_index_to_string( 6477 prop, intval, &unused)); 6478 } 6479 VERIFY0(zap_update(mos, 6480 spa->spa_pool_props_object, propname, 6481 8, 1, &intval, tx)); 6482 spa_history_log_internal(spa, "set", tx, 6483 "%s=%lld", nvpair_name(elem), intval); 6484 } else { 6485 ASSERT(0); /* not allowed */ 6486 } 6487 6488 switch (prop) { 6489 case ZPOOL_PROP_DELEGATION: 6490 spa->spa_delegation = intval; 6491 break; 6492 case ZPOOL_PROP_BOOTFS: 6493 spa->spa_bootfs = intval; 6494 break; 6495 case ZPOOL_PROP_FAILUREMODE: 6496 spa->spa_failmode = intval; 6497 break; 6498 case ZPOOL_PROP_AUTOEXPAND: 6499 spa->spa_autoexpand = intval; 6500 if (tx->tx_txg != TXG_INITIAL) 6501 spa_async_request(spa, 6502 SPA_ASYNC_AUTOEXPAND); 6503 break; 6504 case ZPOOL_PROP_DEDUPDITTO: 6505 spa->spa_dedup_ditto = intval; 6506 break; 6507 default: 6508 break; 6509 } 6510 } 6511 6512 } 6513 6514 mutex_exit(&spa->spa_props_lock); 6515} 6516 6517/* 6518 * Perform one-time upgrade on-disk changes. spa_version() does not 6519 * reflect the new version this txg, so there must be no changes this 6520 * txg to anything that the upgrade code depends on after it executes. 6521 * Therefore this must be called after dsl_pool_sync() does the sync 6522 * tasks. 6523 */ 6524static void 6525spa_sync_upgrades(spa_t *spa, dmu_tx_t *tx) 6526{ 6527 dsl_pool_t *dp = spa->spa_dsl_pool; 6528 6529 ASSERT(spa->spa_sync_pass == 1); 6530 6531 rrw_enter(&dp->dp_config_rwlock, RW_WRITER, FTAG); 6532 6533 if (spa->spa_ubsync.ub_version < SPA_VERSION_ORIGIN && 6534 spa->spa_uberblock.ub_version >= SPA_VERSION_ORIGIN) { 6535 dsl_pool_create_origin(dp, tx); 6536 6537 /* Keeping the origin open increases spa_minref */ 6538 spa->spa_minref += 3; 6539 } 6540 6541 if (spa->spa_ubsync.ub_version < SPA_VERSION_NEXT_CLONES && 6542 spa->spa_uberblock.ub_version >= SPA_VERSION_NEXT_CLONES) { 6543 dsl_pool_upgrade_clones(dp, tx); 6544 } 6545 6546 if (spa->spa_ubsync.ub_version < SPA_VERSION_DIR_CLONES && 6547 spa->spa_uberblock.ub_version >= SPA_VERSION_DIR_CLONES) { 6548 dsl_pool_upgrade_dir_clones(dp, tx); 6549 6550 /* Keeping the freedir open increases spa_minref */ 6551 spa->spa_minref += 3; 6552 } 6553 6554 if (spa->spa_ubsync.ub_version < SPA_VERSION_FEATURES && 6555 spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6556 spa_feature_create_zap_objects(spa, tx); 6557 } 6558 6559 /* 6560 * LZ4_COMPRESS feature's behaviour was changed to activate_on_enable 6561 * when possibility to use lz4 compression for metadata was added 6562 * Old pools that have this feature enabled must be upgraded to have 6563 * this feature active 6564 */ 6565 if (spa->spa_uberblock.ub_version >= SPA_VERSION_FEATURES) { 6566 boolean_t lz4_en = spa_feature_is_enabled(spa, 6567 SPA_FEATURE_LZ4_COMPRESS); 6568 boolean_t lz4_ac = spa_feature_is_active(spa, 6569 SPA_FEATURE_LZ4_COMPRESS); 6570 6571 if (lz4_en && !lz4_ac) 6572 spa_feature_incr(spa, SPA_FEATURE_LZ4_COMPRESS, tx); 6573 } 6574 6575 /* 6576 * If we haven't written the salt, do so now. Note that the 6577 * feature may not be activated yet, but that's fine since 6578 * the presence of this ZAP entry is backwards compatible. 6579 */ 6580 if (zap_contains(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, 6581 DMU_POOL_CHECKSUM_SALT) == ENOENT) { 6582 VERIFY0(zap_add(spa->spa_meta_objset, 6583 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_CHECKSUM_SALT, 1, 6584 sizeof (spa->spa_cksum_salt.zcs_bytes), 6585 spa->spa_cksum_salt.zcs_bytes, tx)); 6586 } 6587 6588 rrw_exit(&dp->dp_config_rwlock, FTAG); 6589} 6590 6591/* 6592 * Sync the specified transaction group. New blocks may be dirtied as 6593 * part of the process, so we iterate until it converges. 6594 */ 6595void 6596spa_sync(spa_t *spa, uint64_t txg) 6597{ 6598 dsl_pool_t *dp = spa->spa_dsl_pool; 6599 objset_t *mos = spa->spa_meta_objset; 6600 bplist_t *free_bpl = &spa->spa_free_bplist[txg & TXG_MASK]; 6601 vdev_t *rvd = spa->spa_root_vdev; 6602 vdev_t *vd; 6603 dmu_tx_t *tx; 6604 int error; 6605 6606 VERIFY(spa_writeable(spa)); 6607 6608 /* 6609 * Lock out configuration changes. 6610 */ 6611 spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER); 6612 6613 spa->spa_syncing_txg = txg; 6614 spa->spa_sync_pass = 0; 6615 6616 /* 6617 * If there are any pending vdev state changes, convert them 6618 * into config changes that go out with this transaction group. 6619 */ 6620 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6621 while (list_head(&spa->spa_state_dirty_list) != NULL) { 6622 /* 6623 * We need the write lock here because, for aux vdevs, 6624 * calling vdev_config_dirty() modifies sav_config. 6625 * This is ugly and will become unnecessary when we 6626 * eliminate the aux vdev wart by integrating all vdevs 6627 * into the root vdev tree. 6628 */ 6629 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6630 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_WRITER); 6631 while ((vd = list_head(&spa->spa_state_dirty_list)) != NULL) { 6632 vdev_state_clean(vd); 6633 vdev_config_dirty(vd); 6634 } 6635 spa_config_exit(spa, SCL_CONFIG | SCL_STATE, FTAG); 6636 spa_config_enter(spa, SCL_CONFIG | SCL_STATE, FTAG, RW_READER); 6637 } 6638 spa_config_exit(spa, SCL_STATE, FTAG); 6639 6640 tx = dmu_tx_create_assigned(dp, txg); 6641 6642 spa->spa_sync_starttime = gethrtime(); 6643#ifdef illumos 6644 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, 6645 spa->spa_sync_starttime + spa->spa_deadman_synctime)); 6646#else /* FreeBSD */ 6647#ifdef _KERNEL 6648 callout_reset(&spa->spa_deadman_cycid, 6649 hz * spa->spa_deadman_synctime / NANOSEC, spa_deadman, spa); 6650#endif 6651#endif 6652 6653 /* 6654 * If we are upgrading to SPA_VERSION_RAIDZ_DEFLATE this txg, 6655 * set spa_deflate if we have no raid-z vdevs. 6656 */ 6657 if (spa->spa_ubsync.ub_version < SPA_VERSION_RAIDZ_DEFLATE && 6658 spa->spa_uberblock.ub_version >= SPA_VERSION_RAIDZ_DEFLATE) { 6659 int i; 6660 6661 for (i = 0; i < rvd->vdev_children; i++) { 6662 vd = rvd->vdev_child[i]; 6663 if (vd->vdev_deflate_ratio != SPA_MINBLOCKSIZE) 6664 break; 6665 } 6666 if (i == rvd->vdev_children) { 6667 spa->spa_deflate = TRUE; 6668 VERIFY(0 == zap_add(spa->spa_meta_objset, 6669 DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_DEFLATE, 6670 sizeof (uint64_t), 1, &spa->spa_deflate, tx)); 6671 } 6672 } 6673 6674 /* 6675 * Iterate to convergence. 6676 */ 6677 do { 6678 int pass = ++spa->spa_sync_pass; 6679 6680 spa_sync_config_object(spa, tx); 6681 spa_sync_aux_dev(spa, &spa->spa_spares, tx, 6682 ZPOOL_CONFIG_SPARES, DMU_POOL_SPARES); 6683 spa_sync_aux_dev(spa, &spa->spa_l2cache, tx, 6684 ZPOOL_CONFIG_L2CACHE, DMU_POOL_L2CACHE); 6685 spa_errlog_sync(spa, txg); 6686 dsl_pool_sync(dp, txg); 6687 6688 if (pass < zfs_sync_pass_deferred_free) { 6689 spa_sync_frees(spa, free_bpl, tx); 6690 } else { 6691 /* 6692 * We can not defer frees in pass 1, because 6693 * we sync the deferred frees later in pass 1. 6694 */ 6695 ASSERT3U(pass, >, 1); 6696 bplist_iterate(free_bpl, bpobj_enqueue_cb, 6697 &spa->spa_deferred_bpobj, tx); 6698 } 6699 6700 ddt_sync(spa, txg); 6701 dsl_scan_sync(dp, tx); 6702 6703 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, txg)) 6704 vdev_sync(vd, txg); 6705 6706 if (pass == 1) { 6707 spa_sync_upgrades(spa, tx); 6708 ASSERT3U(txg, >=, 6709 spa->spa_uberblock.ub_rootbp.blk_birth); 6710 /* 6711 * Note: We need to check if the MOS is dirty 6712 * because we could have marked the MOS dirty 6713 * without updating the uberblock (e.g. if we 6714 * have sync tasks but no dirty user data). We 6715 * need to check the uberblock's rootbp because 6716 * it is updated if we have synced out dirty 6717 * data (though in this case the MOS will most 6718 * likely also be dirty due to second order 6719 * effects, we don't want to rely on that here). 6720 */ 6721 if (spa->spa_uberblock.ub_rootbp.blk_birth < txg && 6722 !dmu_objset_is_dirty(mos, txg)) { 6723 /* 6724 * Nothing changed on the first pass, 6725 * therefore this TXG is a no-op. Avoid 6726 * syncing deferred frees, so that we 6727 * can keep this TXG as a no-op. 6728 */ 6729 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, 6730 txg)); 6731 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6732 ASSERT(txg_list_empty(&dp->dp_sync_tasks, txg)); 6733 break; 6734 } 6735 spa_sync_deferred_frees(spa, tx); 6736 } 6737 6738 } while (dmu_objset_is_dirty(mos, txg)); 6739 6740 /* 6741 * Rewrite the vdev configuration (which includes the uberblock) 6742 * to commit the transaction group. 6743 * 6744 * If there are no dirty vdevs, we sync the uberblock to a few 6745 * random top-level vdevs that are known to be visible in the 6746 * config cache (see spa_vdev_add() for a complete description). 6747 * If there *are* dirty vdevs, sync the uberblock to all vdevs. 6748 */ 6749 for (;;) { 6750 /* 6751 * We hold SCL_STATE to prevent vdev open/close/etc. 6752 * while we're attempting to write the vdev labels. 6753 */ 6754 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 6755 6756 if (list_is_empty(&spa->spa_config_dirty_list)) { 6757 vdev_t *svd[SPA_DVAS_PER_BP]; 6758 int svdcount = 0; 6759 int children = rvd->vdev_children; 6760 int c0 = spa_get_random(children); 6761 6762 for (int c = 0; c < children; c++) { 6763 vd = rvd->vdev_child[(c0 + c) % children]; 6764 if (vd->vdev_ms_array == 0 || vd->vdev_islog) 6765 continue; 6766 svd[svdcount++] = vd; 6767 if (svdcount == SPA_DVAS_PER_BP) 6768 break; 6769 } 6770 error = vdev_config_sync(svd, svdcount, txg, B_FALSE); 6771 if (error != 0) 6772 error = vdev_config_sync(svd, svdcount, txg, 6773 B_TRUE); 6774 } else { 6775 error = vdev_config_sync(rvd->vdev_child, 6776 rvd->vdev_children, txg, B_FALSE); 6777 if (error != 0) 6778 error = vdev_config_sync(rvd->vdev_child, 6779 rvd->vdev_children, txg, B_TRUE); 6780 } 6781 6782 if (error == 0) 6783 spa->spa_last_synced_guid = rvd->vdev_guid; 6784 6785 spa_config_exit(spa, SCL_STATE, FTAG); 6786 6787 if (error == 0) 6788 break; 6789 zio_suspend(spa, NULL); 6790 zio_resume_wait(spa); 6791 } 6792 dmu_tx_commit(tx); 6793 6794#ifdef illumos 6795 VERIFY(cyclic_reprogram(spa->spa_deadman_cycid, CY_INFINITY)); 6796#else /* FreeBSD */ 6797#ifdef _KERNEL 6798 callout_drain(&spa->spa_deadman_cycid); 6799#endif 6800#endif 6801 6802 /* 6803 * Clear the dirty config list. 6804 */ 6805 while ((vd = list_head(&spa->spa_config_dirty_list)) != NULL) 6806 vdev_config_clean(vd); 6807 6808 /* 6809 * Now that the new config has synced transactionally, 6810 * let it become visible to the config cache. 6811 */ 6812 if (spa->spa_config_syncing != NULL) { 6813 spa_config_set(spa, spa->spa_config_syncing); 6814 spa->spa_config_txg = txg; 6815 spa->spa_config_syncing = NULL; 6816 } 6817 6818 spa->spa_ubsync = spa->spa_uberblock; 6819 6820 dsl_pool_sync_done(dp, txg); 6821 6822 /* 6823 * Update usable space statistics. 6824 */ 6825 while (vd = txg_list_remove(&spa->spa_vdev_txg_list, TXG_CLEAN(txg))) 6826 vdev_sync_done(vd, txg); 6827 6828 spa_update_dspace(spa); 6829 6830 /* 6831 * It had better be the case that we didn't dirty anything 6832 * since vdev_config_sync(). 6833 */ 6834 ASSERT(txg_list_empty(&dp->dp_dirty_datasets, txg)); 6835 ASSERT(txg_list_empty(&dp->dp_dirty_dirs, txg)); 6836 ASSERT(txg_list_empty(&spa->spa_vdev_txg_list, txg)); 6837 6838 spa->spa_sync_pass = 0; 6839 6840 spa_config_exit(spa, SCL_CONFIG, FTAG); 6841 6842 spa_handle_ignored_writes(spa); 6843 6844 /* 6845 * If any async tasks have been requested, kick them off. 6846 */ 6847 spa_async_dispatch(spa); 6848 spa_async_dispatch_vd(spa); 6849} 6850 6851/* 6852 * Sync all pools. We don't want to hold the namespace lock across these 6853 * operations, so we take a reference on the spa_t and drop the lock during the 6854 * sync. 6855 */ 6856void 6857spa_sync_allpools(void) 6858{ 6859 spa_t *spa = NULL; 6860 mutex_enter(&spa_namespace_lock); 6861 while ((spa = spa_next(spa)) != NULL) { 6862 if (spa_state(spa) != POOL_STATE_ACTIVE || 6863 !spa_writeable(spa) || spa_suspended(spa)) 6864 continue; 6865 spa_open_ref(spa, FTAG); 6866 mutex_exit(&spa_namespace_lock); 6867 txg_wait_synced(spa_get_dsl(spa), 0); 6868 mutex_enter(&spa_namespace_lock); 6869 spa_close(spa, FTAG); 6870 } 6871 mutex_exit(&spa_namespace_lock); 6872} 6873 6874/* 6875 * ========================================================================== 6876 * Miscellaneous routines 6877 * ========================================================================== 6878 */ 6879 6880/* 6881 * Remove all pools in the system. 6882 */ 6883void 6884spa_evict_all(void) 6885{ 6886 spa_t *spa; 6887 6888 /* 6889 * Remove all cached state. All pools should be closed now, 6890 * so every spa in the AVL tree should be unreferenced. 6891 */ 6892 mutex_enter(&spa_namespace_lock); 6893 while ((spa = spa_next(NULL)) != NULL) { 6894 /* 6895 * Stop async tasks. The async thread may need to detach 6896 * a device that's been replaced, which requires grabbing 6897 * spa_namespace_lock, so we must drop it here. 6898 */ 6899 spa_open_ref(spa, FTAG); 6900 mutex_exit(&spa_namespace_lock); 6901 spa_async_suspend(spa); 6902 mutex_enter(&spa_namespace_lock); 6903 spa_close(spa, FTAG); 6904 6905 if (spa->spa_state != POOL_STATE_UNINITIALIZED) { 6906 spa_unload(spa); 6907 spa_deactivate(spa); 6908 } 6909 spa_remove(spa); 6910 } 6911 mutex_exit(&spa_namespace_lock); 6912} 6913 6914vdev_t * 6915spa_lookup_by_guid(spa_t *spa, uint64_t guid, boolean_t aux) 6916{ 6917 vdev_t *vd; 6918 int i; 6919 6920 if ((vd = vdev_lookup_by_guid(spa->spa_root_vdev, guid)) != NULL) 6921 return (vd); 6922 6923 if (aux) { 6924 for (i = 0; i < spa->spa_l2cache.sav_count; i++) { 6925 vd = spa->spa_l2cache.sav_vdevs[i]; 6926 if (vd->vdev_guid == guid) 6927 return (vd); 6928 } 6929 6930 for (i = 0; i < spa->spa_spares.sav_count; i++) { 6931 vd = spa->spa_spares.sav_vdevs[i]; 6932 if (vd->vdev_guid == guid) 6933 return (vd); 6934 } 6935 } 6936 6937 return (NULL); 6938} 6939 6940void 6941spa_upgrade(spa_t *spa, uint64_t version) 6942{ 6943 ASSERT(spa_writeable(spa)); 6944 6945 spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 6946 6947 /* 6948 * This should only be called for a non-faulted pool, and since a 6949 * future version would result in an unopenable pool, this shouldn't be 6950 * possible. 6951 */ 6952 ASSERT(SPA_VERSION_IS_SUPPORTED(spa->spa_uberblock.ub_version)); 6953 ASSERT3U(version, >=, spa->spa_uberblock.ub_version); 6954 6955 spa->spa_uberblock.ub_version = version; 6956 vdev_config_dirty(spa->spa_root_vdev); 6957 6958 spa_config_exit(spa, SCL_ALL, FTAG); 6959 6960 txg_wait_synced(spa_get_dsl(spa), 0); 6961} 6962 6963boolean_t 6964spa_has_spare(spa_t *spa, uint64_t guid) 6965{ 6966 int i; 6967 uint64_t spareguid; 6968 spa_aux_vdev_t *sav = &spa->spa_spares; 6969 6970 for (i = 0; i < sav->sav_count; i++) 6971 if (sav->sav_vdevs[i]->vdev_guid == guid) 6972 return (B_TRUE); 6973 6974 for (i = 0; i < sav->sav_npending; i++) { 6975 if (nvlist_lookup_uint64(sav->sav_pending[i], ZPOOL_CONFIG_GUID, 6976 &spareguid) == 0 && spareguid == guid) 6977 return (B_TRUE); 6978 } 6979 6980 return (B_FALSE); 6981} 6982 6983/* 6984 * Check if a pool has an active shared spare device. 6985 * Note: reference count of an active spare is 2, as a spare and as a replace 6986 */ 6987static boolean_t 6988spa_has_active_shared_spare(spa_t *spa) 6989{ 6990 int i, refcnt; 6991 uint64_t pool; 6992 spa_aux_vdev_t *sav = &spa->spa_spares; 6993 6994 for (i = 0; i < sav->sav_count; i++) { 6995 if (spa_spare_exists(sav->sav_vdevs[i]->vdev_guid, &pool, 6996 &refcnt) && pool != 0ULL && pool == spa_guid(spa) && 6997 refcnt > 2) 6998 return (B_TRUE); 6999 } 7000 7001 return (B_FALSE); 7002} 7003 7004/* 7005 * Post a sysevent corresponding to the given event. The 'name' must be one of 7006 * the event definitions in sys/sysevent/eventdefs.h. The payload will be 7007 * filled in from the spa and (optionally) the vdev. This doesn't do anything 7008 * in the userland libzpool, as we don't want consumers to misinterpret ztest 7009 * or zdb as real changes. 7010 */ 7011void 7012spa_event_notify(spa_t *spa, vdev_t *vd, const char *name) 7013{ 7014#ifdef _KERNEL 7015 sysevent_t *ev; 7016 sysevent_attr_list_t *attr = NULL; 7017 sysevent_value_t value; 7018 sysevent_id_t eid; 7019 7020 ev = sysevent_alloc(EC_ZFS, (char *)name, SUNW_KERN_PUB "zfs", 7021 SE_SLEEP); 7022 7023 value.value_type = SE_DATA_TYPE_STRING; 7024 value.value.sv_string = spa_name(spa); 7025 if (sysevent_add_attr(&attr, ZFS_EV_POOL_NAME, &value, SE_SLEEP) != 0) 7026 goto done; 7027 7028 value.value_type = SE_DATA_TYPE_UINT64; 7029 value.value.sv_uint64 = spa_guid(spa); 7030 if (sysevent_add_attr(&attr, ZFS_EV_POOL_GUID, &value, SE_SLEEP) != 0) 7031 goto done; 7032 7033 if (vd) { 7034 value.value_type = SE_DATA_TYPE_UINT64; 7035 value.value.sv_uint64 = vd->vdev_guid; 7036 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_GUID, &value, 7037 SE_SLEEP) != 0) 7038 goto done; 7039 7040 if (vd->vdev_path) { 7041 value.value_type = SE_DATA_TYPE_STRING; 7042 value.value.sv_string = vd->vdev_path; 7043 if (sysevent_add_attr(&attr, ZFS_EV_VDEV_PATH, 7044 &value, SE_SLEEP) != 0) 7045 goto done; 7046 } 7047 } 7048 7049 if (sysevent_attach_attributes(ev, attr) != 0) 7050 goto done; 7051 attr = NULL; 7052 7053 (void) log_sysevent(ev, SE_SLEEP, &eid); 7054 7055done: 7056 if (attr) 7057 sysevent_free_attr(attr); 7058 sysevent_free(ev); 7059#endif 7060} 7061